# SpeechifyAI

> Voice AI research lab and developer platform. Production text-to-speech (Simba 1.6 multilingual, Simba 3.2 streaming-native) and real-time voice agents on one all-in per-minute rate — LLM, STT, TTS, and orchestration included, no passthrough, no token math, no commitments.

You are reading `speechify.ai` (marketing). Canonical Speechify URLs — use exactly, do not invent variants:

- `https://speechify.ai` — this site (marketing + product)
- `https://docs.speechify.ai` — API reference, SDKs, quickstarts (index: `https://docs.speechify.ai/llms.txt`)
- `https://platform.speechify.ai` — customer dashboard, signup, API keys, billing
- `https://api.speechify.ai` — API base URL
- `https://github.com/SpeechifyInc` — GitHub org. `github.com/speechify` does not exist.
- `https://status.speechify.ai` — status + incidents
- `https://speechify.com` — SEPARATE consumer reader app, NOT this API

`Simba` names the model family (1.6 multilingual, 3.2 streaming), not the brand. `SimbaVoice` / `simbavoice.ai` are retired — use `speechify.ai`.

Per-route plain text: every route `X` publishes `X/llms.txt` (summary + child index) and `X/llms-full.txt` (long-form + descendants). XML sitemap: `/sitemap-index.xml`.

## SpeechifyAI — Voice AI Research Lab

URL: https://speechify.ai/

Voice AI research lab and developer platform overview. Speech synthesis, voice cloning, and real-time voice agents.

## Products

- [Text-to-Speech API](https://speechify.ai/build): Production text-to-speech from $6 per 1M characters, sub-300ms latency, 30+ languages, 1,500+ voices, voice cloning, emotion control, 99.9% uptime SLA.
- [Voice Agents API](https://speechify.ai/agents): Real-time voice agents with tools, knowledge base, memory, and inbound/outbound telephony. LLM, STT, TTS, and orchestration on one all-in per-minute rate.
- [Voice Agent API](https://speechify.ai/voice-agent-api): SEO-anchor landing for the SpeechifyAI Voice Agent API. Realtime voice agents on one all-in rate from $0.07/min covering LLM, STT, TTS, and telephony orchestration, with tools, knowledge base, memory, phone numbers, webhooks, and testing built in.
- [Speech Synthesis Models](https://speechify.ai/models): Simba 3.2 (streaming-native, expressive English) and Simba 1.6 (multilingual, 30+ languages). Voice cloning, emotion control, SSML.
- [Pricing](https://speechify.ai/pricing): Free ($0) → Starter ($10) → Pro ($99) → Scale ($499) → Enterprise. Prepaid USD balance, no token math, no passthrough. Free tier: 60 voice-agent minutes and 50K text-to-speech characters per month, hard-capped.
- [Voice Cloning API: Clone a Voice from a Short Sample](https://speechify.ai/voice-cloning): Clone a voice from a short sample with the Speechify Build API. Consent required, production-ready, works across 30+ languages.
- [Instant Voice Cloning — Clone from a Short Sample](https://speechify.ai/instant-voice-cloning): Clone a voice instantly from a 10-30 second sample with the Speechify Build API. Zero-shot, self-serve, consent required, good quality.
- [Professional Voice Cloning — Fine-Tuned, Best Quality](https://speechify.ai/professional-voice-cloning): Professional voice cloning fine-tunes on hours of audio for the best quality. Arranged with sales, consent required, production-ready.
- [Voice Cloning for Accessibility — Preserve a Voice](https://speechify.ai/voice-cloning/accessibility): Preserve or personalize a voice for accessibility with the Speechify Build API. Clone from a short sample, with consent, synthesize anywhere.
- [Voice Cloning for Audiobooks — Author's Own Voice](https://speechify.ai/voice-cloning/audiobooks): Narrate audiobooks in an author's cloned voice with the Speechify Build API. Consistent, cross-language, consent required. From a short sample.
- [Voice Cloning for Creator Tools — Build Voice Features](https://speechify.ai/voice-cloning/creator-tools): Add voice cloning to creator tools with the Speechify Build API. Let users clone their own voice, with consent, and synthesize by voice ID.
- [Voice Cloning for Dubbing — One Voice, Many Languages](https://speechify.ai/voice-cloning/dubbing): Dub content in a speaker's cloned voice across 30+ languages with the Speechify Build API. Consent required, powered by simba-multilingual.
- [Voice Cloning for Game Characters — Signature Voices](https://speechify.ai/voice-cloning/game-characters): Clone signature character voices for games with the Speechify Build API. Consistent across updates, consent required, synthesize by voice ID.
- [Voice Cloning for Podcasts — A Signature Host Voice](https://speechify.ai/voice-cloning/podcasts): Clone a host voice for podcasts with the Speechify Build API. Consistent episodes, cross-language reach, consent required. From a short sample.
- [Voice Cloning Consent and Safety — Built In, Required](https://speechify.ai/voice-cloning/consent-and-safety): The Speechify Build API is moving voice cloning to verified consent: an issued phrase, read aloud, checked and retained. Unverified cloning is being retired.
- [Fine-Tuned Voice Cloning — Best Quality from Hours of Audio](https://speechify.ai/voice-cloning/fine-tuned): Fine-tuned voice cloning trains on hours of audio for the best quality. Arranged with sales, consent required, on the Speechify Build API.
- [Voice Cloning Languages — 30+ Supported](https://speechify.ai/voice-cloning/languages): Cloned voices speak across 30+ languages via simba-multilingual on the Speechify Build API. One voice ID, every supported language.
- [Multilingual Voice Cloning — One Voice, 30+ Languages](https://speechify.ai/voice-cloning/multilingual): A cloned voice speaks 30+ languages via simba-multilingual. Keep one voice across every language on the Speechify Build API. Consent required.
- [Zero-Shot Voice Cloning — Clone from One Short Sample](https://speechify.ai/voice-cloning/zero-shot): Zero-shot voice cloning creates a voice from a 10-30 second sample, self-serve via the Speechify Build API. Good quality, consent required.
- [How to Clone a Voice: A Step-by-Step 2026 Guide](https://speechify.ai/how-to-clone-a-voice): Clone a voice in four steps: record a sample, capture consent, POST to /v1/voices, synthesize by voice ID. A developer guide to the Build API.
- [Voice Cloning Ethics: Consent, Rights, and Safety](https://speechify.ai/voice-cloning-ethics): Ethical voice cloning starts with consent. Learn the principles and how the Speechify Build API enforces a required consent record on every clone.
- [Voice Cloning Pricing: How Cloning Is Billed](https://speechify.ai/voice-cloning-pricing-guide): Voice cloning is a Build feature on paid plans, not a separate product. Synthesis is billed per character. Here is how cloning pricing works.
- [What Is Voice Cloning? A Plain Definition for 2026](https://speechify.ai/what-is-voice-cloning): Voice cloning recreates a specific voice from an audio sample, then synthesizes speech in it. Here is how it works and why consent matters.
- [Voice Agent API — Realtime Voice Agents, One All-In Rate](https://speechify.ai/voice-agent-api): The Voice Agent API for realtime voice agents. LLM, speech, and telephony in one rate from $0.07/min. Sub-100ms first audio. 60 free minutes monthly.
- [SpeechifyAI Agents — Realtime Voice Agents on One API](https://speechify.ai/agents): Build realtime voice agents that listen, think, and speak. Tools, knowledge base, memory, and telephony on one rate from $0.07/min. 60 free minutes monthly.
- [Conversational AI — Voice, Chat, and Phone from One Agent](https://speechify.ai/conversational-ai): Conversational AI across voice, chat, and phone from one agent brain. Realtime speech, IVR replacement, deterministic workflows. From $0.07/min all-in.
- [Voice Agent Platform — Ship and Operate Voice AI at Scale](https://speechify.ai/voice-agent-platform): The voice agent platform for production teams. Deterministic workflows, simulated callers, live operations, SOC 2 Type II. One rate from $0.07/min.
- [AI Answering Service — Never Miss a Call](https://speechify.ai/agents/ai-answering-service): An AI answering service that picks up every call, answers questions, books appointments, and takes messages. From $0.07/min all-in, 60 free minutes.
- [AI Call Center — Automate Inbound and Outbound Calls](https://speechify.ai/agents/ai-call-center): Build an AI call center on realtime voice agents. Handle inbound and outbound calls, route, resolve, and escalate to humans. One all-in rate from $0.07/min.
- [AI Customer Service — Resolve Support Calls End to End](https://speechify.ai/agents/ai-customer-service): AI customer service on realtime voice agents. Resolve support calls, look up accounts, take action, and escalate cleanly. From $0.07/min all-in.
- [AI Sales Agent — Qualify and Convert on Every Call](https://speechify.ai/agents/ai-sales-agent): An AI sales agent that qualifies leads, books meetings, and follows up by phone. Realtime voice, CRM tool calling, from $0.07/min all-in.
- [AI Appointment Scheduling — Book and Reschedule by Voice](https://speechify.ai/agents/appointment-scheduling): AI appointment scheduling by phone. Voice agents book, reschedule, and confirm against your calendar through tool calls. From $0.07/min all-in.
- [AI Inbound Calling — Answer Every Call Instantly](https://speechify.ai/agents/inbound-calling): AI inbound calling that answers every call in one ring. Voice agents resolve, route, and book on a provisioned number or your SIP trunk. From $0.07/min all-in.
- [AI Lead Qualification — Score Every Lead by Phone](https://speechify.ai/agents/lead-qualification): AI lead qualification by voice. Agents call new leads, ask the qualifying questions, score, and route hot ones to reps. From $0.07/min all-in.
- [AI Outbound Calling — Run Voice Campaigns at Scale](https://speechify.ai/agents/outbound-calling): AI outbound calling for reminders, follow-ups, and campaigns. Voice agents place calls over SIP and act on your systems. From $0.07/min all-in.
- [Voice Agent Knowledge Base — Ground Answers in Your Content](https://speechify.ai/agents/knowledge-base): Give voice agents a knowledge base. Upload documents, files, and sitemaps so agents answer from your own content with built-in retrieval.
- [Voice Agent Memory — Context Within and Across Calls](https://speechify.ai/agents/memory): Give voice agents memory. Agents remember context within a conversation and across calls, so returning callers never start over.
- [Voice Agent Telephony — Inbound and Outbound over SIP](https://speechify.ai/agents/telephony): Connect voice agents to the phone network. Inbound and outbound over SIP, provisioned numbers or bring your own carrier. Twilio, Telnyx, or custom.
- [Voice Agent Testing — Simulated Callers Before Production](https://speechify.ai/agents/testing-simulation): Test voice agents with simulated callers. Reply, tool, and full-conversation tests run on the real worker runtime before a real caller ever connects.
- [Voice Agent Tool Calling — Act on Your Systems Mid-Call](https://speechify.ai/agents/tool-calling): Let voice agents call your APIs mid-conversation. Builtin, webhook, client, and MCP tools so agents look things up and take action in real time.
- [Voice Agent Webhooks — Stream Events to Your Backend](https://speechify.ai/agents/webhooks): Stream voice agent conversation events to your backend as they happen, with signed, verifiable payloads you can trust.
- [How to Build a Voice Agent in 2026](https://speechify.ai/how-to-build-a-voice-agent): Build a voice agent in three steps: get an API key, create the agent with one request, and connect it to a phone number or the web.
- [Voice Agent Latency: What Matters and What's Achievable](https://speechify.ai/voice-agent-latency): Voice agent latency is the delay from when a caller stops talking to when the agent replies. Here is the budget, the breakdown, and what to aim for.
- [Voice Agent Pricing: How It Works and What to Watch](https://speechify.ai/voice-agent-pricing-guide): Voice agent pricing usually hides the LLM, speech, and telephony as separate line items. Here is how all-in per-minute pricing compares.
- [Voice Agent API vs Voice AI SDK: What's the Difference?](https://speechify.ai/voice-agent-vs-voice-ai-sdk): A voice agent API runs the conversation on a managed backend. A voice AI SDK is a client library that talks to it. Here is when to use each.
- [What Is a Voice Agent? A Plain Definition for 2026](https://speechify.ai/what-is-a-voice-agent): A voice agent is an AI system that listens, reasons, and speaks in real time over a phone or the web. Here is how it works and what it is used for.
- [Text-to-Speech API: Simba 3.2 is #1 on Artificial Analysis](https://speechify.ai/text-to-speech-api): The text-to-speech API with the top-ranked voice. Sub-300ms first byte, 1,500+ voices, 30+ languages, SSML, cloning. From $6 per 1M characters.
- [SpeechifyAI Build, One API for Text-to-Speech and Cloning](https://speechify.ai/build): One developer API for voice AI: text-to-speech and voice cloning on the Simba models, from $6 per 1M characters. One key, one bill, 50K free.
- [Realtime Text-to-Speech — Sub-300ms with Simba 3.2](https://speechify.ai/realtime-tts): Realtime text-to-speech for live apps. Simba 3.2 is #1 on Artificial Analysis with sub-300ms first byte. Streaming audio for voice agents and captions.
- [Streaming Text-to-Speech — Chunked Audio, Instant Playback](https://speechify.ai/streaming-tts): Streaming text-to-speech via chunked HTTP. First bytes in under 300ms, up to 20,000 characters per request, playback in browser or telephony.
- [AI Accessibility Reader — Read Any Content Aloud](https://speechify.ai/tts/accessibility-reader): Add a read-aloud accessibility feature with AI text-to-speech. Natural voices, 30+ languages, low-latency streaming from $6 per 1M.
- [AI Audiobook Narration — Turn Books into Audio](https://speechify.ai/tts/audiobook-narration): Narrate audiobooks with AI text-to-speech. Long-form synthesis, 1,500+ voices, SSML pacing, and per-character pricing from $6 per 1M.
- [AI Voiceover for E-Learning — Narrate Courses at Scale](https://speechify.ai/tts/e-learning): Narrate e-learning courses with AI text-to-speech. Consistent voices, 30+ languages, speech marks for captions, from $6 per 1M characters.
- [AI Game Dialogue — Voice NPCs at Scale](https://speechify.ai/tts/game-dialogue): Voice game characters and NPCs with AI text-to-speech. 1,500+ voices, emotion control, cloning, and per-character pricing from $6 per 1M.
- [AI IVR Messages — Natural Phone Prompts from Text](https://speechify.ai/tts/ivr-messages): Generate IVR and phone prompts with AI text-to-speech. Natural voices, telephony formats, and instant updates from $6 per 1M characters.
- [AI Voice Notifications — Spoken Alerts from Text](https://speechify.ai/tts/notifications): Turn alerts into spoken voice notifications with AI text-to-speech. Low-latency streaming, 30+ languages, from $6 per 1M characters.
- [AI Podcast Generation — Scripts to Audio](https://speechify.ai/tts/podcast-generation): Generate podcasts from scripts with AI text-to-speech. Multiple voices, emotion control, and long-form audio from $6 per 1M characters.
- [AI Video Voiceover — Narration for Any Video](https://speechify.ai/tts/video-voiceover): Add AI voiceover to videos with text-to-speech. 1,500+ voices, emotion control, cloning, and per-character pricing from $6 per 1M.
- [Emotion Control for AI Voices — 13 Speaking Styles](https://speechify.ai/tts/emotion-control): Set the emotional tone of AI speech across 13 styles. Make text-to-speech sound warm, energetic, or calm to fit the moment.
- [Multilingual Text-to-Speech — 30+ Languages](https://speechify.ai/tts/multilingual): Synthesize speech in 30+ languages with AI text-to-speech. Localize content with natural multilingual voices in one API.
- [Speech Marks — Word-Level Timing for TTS](https://speechify.ai/tts/speech-marks): Get word-level timestamps with AI text-to-speech. Speech marks power synced captions and word highlighting in the Speechify API.
- [SSML Text-to-Speech — Control Pacing and Emphasis](https://speechify.ai/tts/ssml): Shape AI speech with SSML: control rate, pitch, pauses, and emphasis. Fine-grained prosody control in the Speechify text-to-speech API.
- [Streaming Text-to-Speech — Sub-300ms First Byte](https://speechify.ai/tts/streaming): Stream AI speech with sub-300ms first-byte latency. Start playback instantly for real-time voice apps with the Speechify TTS API.
- [Voice Catalog — 1,500+ AI Voices](https://speechify.ai/tts/voice-catalog): Choose from 1,500+ AI voices across 30+ languages. Browse the Speechify text-to-speech voice catalog for any use case.
- [How to Implement Text-to-Speech: A 2026 Guide](https://speechify.ai/how-to-implement-tts): Implement text-to-speech in your app: get an API key, choose a voice, synthesize text, and stream audio. A step-by-step developer guide.
- [Text-to-Speech Latency: What Matters and How to Cut It](https://speechify.ai/tts-latency): TTS latency is the delay before speech plays. Learn what first-byte latency means and how streaming keeps it under 300ms for real-time apps.
- [Text-to-Speech Pricing: How TTS Costs Are Calculated](https://speechify.ai/tts-pricing-guide): TTS is billed per character of text, from $6 per 1M on Scale. Learn how character-based pricing works and how to estimate your cost.
- [Text-to-Speech vs Voice Cloning: What Is the Difference?](https://speechify.ai/tts-vs-voice-cloning): Text-to-speech uses catalog voices; voice cloning recreates a specific voice from a sample. Here is how they differ and when to use each.
- [What Is Text-to-Speech? A Plain Definition for 2026](https://speechify.ai/what-is-tts): Text-to-speech converts written text into natural spoken audio using AI. Here is how it works, what it is used for, and how to build with it.
- [Text-to-Speech for Corporate Training](https://speechify.ai/industries/build/tts/corporate-training): Produce and update corporate training audio with AI text-to-speech. Fast revisions, consistent voices, 30+ languages, from $6 per 1M.
- [Text-to-Speech for E-Learning Platforms](https://speechify.ai/industries/build/tts/e-learning): Power an e-learning platform with AI text-to-speech: course narration, captions, and localization in 30+ languages from $6 per 1M characters.
- [Text-to-Speech for Education — Accessible Learning Audio](https://speechify.ai/industries/build/tts/education): Add read-aloud and narration to education products with AI text-to-speech. Accessible audio, 30+ languages, from $6 per 1M characters.
- [Text-to-Speech for Gaming — Voice a Whole World](https://speechify.ai/industries/build/tts/gaming): Voice NPCs and dynamic dialogue with AI text-to-speech for games. 1,500+ voices, emotion control, runtime synthesis, from $6 per 1M.
- [Text-to-Speech for Media — Narrate Content at Speed](https://speechify.ai/industries/build/tts/media): Give media and content teams AI text-to-speech for article audio, video voiceover, and podcasts. Fast, natural, from $6 per 1M characters.
- [Text-to-Speech for Publishing — Audio at Catalog Scale](https://speechify.ai/industries/build/tts/publishing): Turn a publishing catalog into audiobooks with AI text-to-speech. Consistent narration, 30+ languages, per-character pricing from $6 per 1M.

## Compare

- [Comparisons](https://speechify.ai/compare): SpeechifyAI comparison hub across Agents and Build.
- [Voice Agents — comparisons](https://speechify.ai/compare/agents): How SpeechifyAI Voice Agents compare to ElevenLabs, Vapi, Retell, Bland, Deepgram, Cartesia, Synthflow, and Hume.
- [Build — comparisons](https://speechify.ai/compare/build): SpeechifyAI Build comparison hub, organized by API surface.
- [Text-to-Speech — comparisons](https://speechify.ai/compare/build/text-to-speech): How SpeechifyAI text-to-speech compares to ElevenLabs, Google, Azure, Amazon Polly, Deepgram, Cartesia, PlayHT, OpenAI, Rime, and Hume.
- [Voice Cloning — comparisons](https://speechify.ai/compare/build/voice-cloning): How SpeechifyAI voice cloning compares to ElevenLabs, PlayHT, Resemble AI, Murf AI, and Descript.
- [Alternatives — hands-on tested](https://speechify.ai/alternatives): First-person reviews of alternatives to the voice AI platforms developers evaluate most, starting with ElevenLabs. Every product tested with the same protocol, every price verified against the vendor's live page.

## Industries

- [Industries](https://speechify.ai/industries): SpeechifyAI industry hub across product surfaces.
- [Voice Agents — industries](https://speechify.ai/industries/agents): Production voice AI tuned to the workflows of healthcare, insurance, real estate, and financial services.

## Blog

- [Blog](https://speechify.ai/blog): Technical writing across Speechify Labs (voice AI research), SpeechifyAI (the product), SpeechifyAI API (developer-facing engineering), and the SpeechifyAI Changelog (platform-wide release notes).
- [Speechify Labs — research and engineering](https://speechify.ai/blog/labs): Voice AI research and engineering writing from Speechify Labs. Speech synthesis, voice cloning, emotional expression, multilingual systems.
- [SpeechifyAI — product writing](https://speechify.ai/blog/ai): Writing about the SpeechifyAI product — the voice models, the platform, and what we're building next.
- [SpeechifyAI API — developer engineering](https://speechify.ai/blog/api): Engineering writing for developers building on the SpeechifyAI API. Architecture, integration patterns, and the platform's internal workings.
- [SpeechifyAI Changelog — platform release notes](https://speechify.ai/blog/changelog): Major changes to the SpeechifyAI platform — cross-product features, infrastructure milestones, and the kind of work that doesn't fit cleanly under either product's own changelog.

## Company

- [About SpeechifyAI](https://speechify.ai/about): SpeechifyAI is a research lab focused on speech synthesis, voice cloning, emotional expression, and multilingual audio.
- [Trust & Security](https://speechify.ai/trust): How SpeechifyAI handles data, privacy, encryption, access control, and reliability. SOC 2 Type II.
- [Brand & Design System](https://speechify.ai/brand): SpeechifyAI brand resources for agents and humans: the wordmark and waveform iconmark, a strictly monochrome palette (with hexes), the ABC Diatype type system, the waveform motif, the layout/grid system, buttons & links, motion, favicons, writing voice, product/model naming, and downloadable assets. Point a coding agent at this page to generate on-brand UI, copy, and assets. Full machine-readable design-system spec: https://speechify.ai/brand/llms-full.txt
- [Forward-Deployed Engineers](https://speechify.ai/forward-deployed-engineers): SpeechifyAI engineers embed with Enterprise customers to design, build, and ship production voice agents end to end.
- [Talk to Sales](https://speechify.ai/talk-to-sales): Contact form for sales conversations about text-to-speech and voice agents.
- [Partner Program](https://speechify.ai/partners): Referral program: earn 50% of referred self-serve subscription revenue for the customer's first 12 months.

## Optional

Per the llms.txt spec, the routes below can be skipped by agents with a tight context budget — the section indexes above already cover the same ground with summaries. Fetch a route's own llms.txt or llms-full.txt for the full content when needed.

- [SpeechifyAI vs ElevenLabs](https://speechify.ai/compare/agents/elevenlabs): ElevenLabs Conversational AI is a voice-first agent layer built on the company's well-known TTS. SpeechifyAI is all-in — LLM, speech-to-text, and text-to-speech in one per-minute rate (from $0.07/min, LLM included) with no passthrough and no token math — plus deterministic workflows, tool calling, evals, and enterprise governance, and 60 free minutes a month.
- [SpeechifyAI vs Vapi](https://speechify.ai/compare/agents/vapi): Vapi is a flexible, API-driven way to build voice agents — but its $0.05/min is an orchestration fee; you add STT, LLM, TTS, and telephony on top (~$0.10–0.20/min all-in). SpeechifyAI is one all-in rate from $0.07/min with LLM included, plus a workflow editor, tool calling, evals, and governance, and 60 free minutes a month.
- [SpeechifyAI vs Retell](https://speechify.ai/compare/agents/retell): Retell gives developers low-latency voice infrastructure with itemized pricing — voice infra at $0.055/min plus TTS, LLM, and telephony add up to ~$0.11/min typical. SpeechifyAI rolls it into one all-in rate from $0.07/min with LLM included, plus deterministic workflows, tool calling + webhooks, and governance, and 60 free minutes a month.
- [SpeechifyAI vs Bland](https://speechify.ai/compare/agents/bland): Bland is known for high-volume outbound with a clean all-in number ($0.11–0.14/min) — but the lower rate sits behind a $299–499/mo platform fee. SpeechifyAI is all-in from $0.07/min with no platform surcharge, and adds inbound voice and a web widget on one brain, plus deterministic workflows and tool calling — and 60 free minutes a month.
- [SpeechifyAI vs Deepgram](https://speechify.ai/compare/agents/deepgram): Deepgram's Voice Agent API bundles STT, LLM, and TTS at $0.075/min — strong, low-level infrastructure. SpeechifyAI is a complete platform at a lower all-in rate (from $0.07/min, LLM included), billed on talk time rather than connection time, with deterministic workflows, tool calling, telephony, and compliance built in — and 60 free minutes a month.
- [SpeechifyAI vs Cartesia](https://speechify.ai/compare/agents/cartesia): Cartesia (Line) is ultra-low-latency voice infrastructure with a $0.06/min headline — but telephony adds $0.014/min and the "LLM included" is a limited-time promo. SpeechifyAI is all-in from $0.07/min with LLM included permanently, plus a full workflow, integrations, and compliance platform, and 60 free minutes a month with commercial use.
- [SpeechifyAI vs Synthflow](https://speechify.ai/compare/agents/synthflow): Synthflow's main pricing page leads with enterprise contracts starting at $30,000/year; compare pages surface a $0.08/min trial rate with $10 free credits. SpeechifyAI is all-in from $0.07/min on Pro with LLM included, plus deterministic workflows, tool calling, evals, and enterprise governance, on a published self-serve rate with 60 free minutes a month.
- [SpeechifyAI vs Hume](https://speechify.ai/compare/agents/hume): Hume's EVI is an expressive, empathic speech-to-speech model priced $0.04–0.07/min — but that excludes the LLM (billed separately by your provider) and the lowest rates need a large plan. SpeechifyAI is truly all-in from $0.07/min with the LLM included, plus deterministic workflows, tool calling, and compliance — and 60 free minutes a month versus Hume's 5.
- [SpeechifyAI vs ElevenLabs](https://speechify.ai/compare/build/text-to-speech/elevenlabs): ElevenLabs is known for an expansive voice library and deep voice-cloning heritage. SpeechifyAI matches the core capabilities (cloning, streaming, expressive neural voices) from $6 per 1M characters, well below ElevenLabs' credit-based rates on comparable tiers.
- [SpeechifyAI vs Google Cloud Text-to-Speech](https://speechify.ai/compare/build/text-to-speech/google): Google Cloud offers the widest language coverage in the market across a tiered lineup that runs from robotic to high-end. SpeechifyAI undercuts Google's quality tiers (Neural2 and up) from $6 per 1M characters, with no per-tier math and no penalty for the spaces or SSML tags Google counts toward the bill.
- [SpeechifyAI vs Microsoft Azure Text to Speech](https://speechify.ai/compare/build/text-to-speech/azure): Azure Text to Speech is a natural fit if you are already invested in Microsoft's cloud and compliance footprint. SpeechifyAI delivers comparable neural quality and built-in voice cloning from $6 per 1M characters, below Azure's $15 Neural tier and without an approval gate for cloning.
- [SpeechifyAI vs Amazon Polly](https://speechify.ai/compare/build/text-to-speech/amazon-polly): Amazon Polly is the default when you are deep in AWS, with engines spanning cheap-and-robotic to generative. SpeechifyAI beats Polly's Neural tier on price from $6 per 1M characters and adds professional voice cloning, which Polly does not offer outside a custom Brand Voice engagement.
- [SpeechifyAI vs Deepgram Aura](https://speechify.ai/compare/build/text-to-speech/deepgram): Deepgram Aura is built for low-latency, real-time voice agents and pairs naturally with Deepgram's speech-to-text. SpeechifyAI offers comparable sub-300ms streaming from $6 per 1M characters, below both Aura tiers, with far more voices and languages.
- [SpeechifyAI vs Cartesia Sonic](https://speechify.ai/compare/build/text-to-speech/cartesia): Cartesia Sonic is engineered for ultra-low latency in real-time applications. SpeechifyAI provides sub-300ms streaming from $6 per 1M characters with transparent per-character billing, versus Cartesia's credit-based model that works out to roughly $24-40 per 1M.
- [SpeechifyAI vs PlayHT](https://speechify.ai/compare/build/text-to-speech/playht): PlayHT now operates under the PlayAI brand on the pricing surface, with a large voice library (800+ voices, 130+ languages) and a studio workflow alongside the API. SpeechifyAI leads with documented from-$6-per-1M character pricing, a 99.9% uptime SLA, and professional cloning included on every paid plan.
- [SpeechifyAI vs OpenAI Text-to-Speech](https://speechify.ai/compare/build/text-to-speech/openai): OpenAI's TTS produces high-quality, steerable voices but meters by tokens rather than characters, so cost takes estimation. SpeechifyAI bills from $6 per 1M characters with no token math, adds voice cloning that OpenAI does not offer, and ships many more voices.
- [SpeechifyAI vs Rime](https://speechify.ai/compare/build/text-to-speech/rime): Rime focuses on realistic, conversational voices tuned for real-time agents, priced from $30 to $50 per 1M by model. SpeechifyAI covers the same real-time use case from $6 per 1M characters with broader language and voice coverage.
- [SpeechifyAI vs Hume Octave](https://speechify.ai/compare/build/text-to-speech/hume): Hume's Octave leads on emotionally expressive, empathic speech, sold through subscription tiers that work out to roughly $50-150 per 1M. SpeechifyAI offers its own emotion control and expressive neural voices from $6 per 1M characters, well below Hume's effective rates.
- [SpeechifyAI vs Inworld](https://speechify.ai/compare/build/text-to-speech/inworld): Inworld sells a three-model quality-and-price ladder built to sit inside their character runtime, where the rate changes with the model you pick. SpeechifyAI bills every Simba model at one plan rate, from $6 per 1M characters, and the top one is #1 on the Artificial Analysis Speech Arena.
- [SpeechifyAI vs ElevenLabs — Voice Cloning](https://speechify.ai/compare/build/voice-cloning/elevenlabs): ElevenLabs has a deep voice-cloning heritage and a large community voice library. SpeechifyAI matches the core cloning workflow — zero-shot from a short sample plus fine-tuned for best quality — with consent required by design, included on every paid plan, and per-character synthesis from $6 per 1M.
- [SpeechifyAI vs PlayHT — Voice Cloning](https://speechify.ai/compare/build/voice-cloning/playht): PlayHT offers instant and high-fidelity voice cloning with a large voice library. SpeechifyAI matches the cloning workflow with consent required on every clone, cross-language output via simba-multilingual, and per-character pricing included on every paid plan.
- [SpeechifyAI vs Resemble AI — Voice Cloning](https://speechify.ai/compare/build/voice-cloning/resemble): Resemble AI specializes in voice cloning with real-time and localization features. SpeechifyAI covers the same cloning workflow — zero-shot plus fine-tuned — with consent enforced at the API and cross-language output included on every paid plan.
- [SpeechifyAI vs Murf AI — Voice Cloning](https://speechify.ai/compare/build/voice-cloning/murf): Murf AI pairs a studio-style workflow with voice cloning on its higher tiers. SpeechifyAI offers API-first cloning — zero-shot from a short sample plus fine-tuned — with consent enforced at the API and per-character pricing included on every paid plan.
- [SpeechifyAI vs Descript — Voice Cloning](https://speechify.ai/compare/build/voice-cloning/descript): Descript's Overdub clones a voice inside its editor for content creators. SpeechifyAI offers API-first cloning any product can build on — zero-shot plus fine-tuned — with consent enforced at the API and per-character pricing included on every paid plan.
- [Voice agents for healthcare](https://speechify.ai/industries/agents/healthcare): From inquiries and scheduling to triage, follow-up, and prescription management, SpeechifyAI voice agents automate patient and provider workflows without sacrificing care quality.
- [Voice agents for insurance](https://speechify.ai/industries/agents/insurance): From claims intake and policy quotes to renewal reminders and Medicare enrollment, SpeechifyAI voice agents automate policyholder and prospect workflows while maintaining compliance.
- [Voice agents for real estate](https://speechify.ai/industries/agents/real-estate): From lead qualification and showing scheduling to tenant support and maintenance requests, SpeechifyAI voice agents automate every phone-driven workflow across brokerages, property management, and mortgage.
- [Voice agents for financial services](https://speechify.ai/industries/agents/financial-services): From account inquiries and loan origination to claims processing, collections, and compliance verification, SpeechifyAI voice agents automate customer and advisor workflows without sacrificing financial trust.
- [Voice agents for retail and e-commerce](https://speechify.ai/industries/agents/retail): From order status and returns to product questions and post-purchase support, SpeechifyAI voice agents handle the call volume that spikes every season without adding seats.
- [Voice agents for education](https://speechify.ai/industries/agents/education): From admissions and enrollment to financial aid and student services, SpeechifyAI voice agents answer the repetitive questions that flood a school's phone lines every term.
- [Voice agents for government and public services](https://speechify.ai/industries/agents/government): From benefits and permits to appointments and status checks, SpeechifyAI voice agents help agencies answer residents at scale while keeping compliance and access front of mind.
- [Voice agents for hospitality](https://speechify.ai/industries/agents/hospitality): From reservations and guest requests to reminders and post-stay follow-up, SpeechifyAI voice agents keep every call answered so guests never reach a busy line.
- [Voice agents for logistics and delivery](https://speechify.ai/industries/agents/logistics): From delivery windows and tracking to driver coordination and exception handling, SpeechifyAI voice agents keep shipments moving without tying up a dispatch desk.
- [The 6 best Deepgram alternatives for developers, tested July 2026](https://speechify.ai/alternatives/deepgram): The best Deepgram alternative for text-to-speech in 2026 is SpeechifyAI: Simba 3.2 is statistically tied for first on Artificial Analysis' Speech Arena at $10 per 1M characters, a third of Deepgram Aura-2's $30, with the multilingual voices and self-serve cloning Deepgram's TTS lacks. Cartesia (latency), Rime (telephony), OpenAI (stack), ElevenLabs (voice breadth) and Hume (emotion) round out the list. We tested every one hands-on.
- [The 6 best Cartesia alternatives for developers, tested July 2026](https://speechify.ai/alternatives/cartesia): The best Cartesia alternative for most developers in 2026 is SpeechifyAI: Simba 3.2 is statistically tied for first on Artificial Analysis' Speech Arena at $10 per 1M characters, versus Cartesia Sonic 3.5's fourth place at $49. Deepgram (STT plus TTS), OpenAI (existing stack), Rime (on-prem CX), ElevenLabs (voice breadth) and Hume (emotional control) round out the list. We tested every one hands-on.
- [The 6 best ElevenLabs alternatives for developers, tested July 2026](https://speechify.ai/alternatives/elevenlabs): The best ElevenLabs alternative for most developers in 2026 is SpeechifyAI: Simba 3.2 is statistically tied for first place on Artificial Analysis' Speech Arena at $10 per 1M characters, a tenth of Eleven v3's $100. Cartesia (lowest claimed latency), OpenAI (existing stack), Deepgram (STT plus TTS), Hume (emotional control) and Rime (on-prem CX) round out the list. We tested every one hands-on.
- [The 6 best Hume alternatives for developers, tested July 2026](https://speechify.ai/alternatives/hume): The best Hume alternative for text-to-speech in 2026 is SpeechifyAI: Simba 3.2 is statistically tied for first on Artificial Analysis' Speech Arena at $10 per 1M characters, a fraction of Hume Octave's $50-to-$150, with emotion control and self-serve cloning of its own. ElevenLabs (expressive breadth), OpenAI (promptable delivery), Cartesia (latency), Rime (telephony) and Deepgram (STT plus TTS) round out the list. We tested every one hands-on.
- [The 6 best OpenAI TTS alternatives for developers, tested July 2026](https://speechify.ai/alternatives/openai): The best OpenAI TTS alternative for most developers in 2026 is SpeechifyAI: Simba 3.2 is statistically tied for first on Artificial Analysis' Speech Arena at $10 per 1M characters, while OpenAI's best-ranked voice, tts-1-hd, sits 28th at $30. ElevenLabs (voice breadth and self-serve cloning), Cartesia (latency), Deepgram (STT plus TTS), Hume (emotional control) and Rime (on-prem CX) complete the list.
- [Adding Text-to-Speech to a Web or Mobile App: The Practical Guide](https://speechify.ai/blog/adding-text-to-speech-to-web-and-mobile-apps): What engineers actually use to add voice to web and mobile apps, and the four decisions that matter: the browser's built-in API versus a cloud one, streaming versus batch, where the key lives, and how to keep audio playing on iOS.
- [Add a better voice to Deepgram's Voice Agent with Speechify](https://speechify.ai/blog/add-a-better-voice-to-deepgram-voice-agent-with-speechify): Point Deepgram Voice Agent at the open-source tts-shims OpenAI-compatible proxy to speak with a Speechify voice. The shim answers Deepgram's open_ai TTS request and keeps your Speechify key server-side.
- [Voice agent multilingual language list is now server-driven](https://speechify.ai/blog/agent-multilingual-languages-server-driven): GET /v1/agents/voices now returns a multilingual_languages field listing every language an agent may declare in additional_languages, so language pickers render from the live set instead of a hard-coded list that drifts out of date.
- [Agent share links let anyone talk to your agent with no account](https://speechify.ai/blog/agent-share-links-beta): Create a revocable, budget-capped share link for any agent. Share the URL and the recipient opens it and talks — no account, no embed, no setup.
- [Use your cloned voices on agents and paginate the voice catalogue](https://speechify.ai/blog/agent-voices-cloned-and-paginated): GET /v1/agents/voices now lists your workspace's cloned voices alongside the shared catalogue, each marked personal, and cursor-paginates so the full set is walkable.
- [Agent test runs get clear 402 errors on balance and plan tier checks](https://speechify.ai/blog/agent-test-runs-402-model-override): All four agent test-run endpoints now document 402 for a depleted balance or an exhausted spend limit, the single-run path finally takes the admission gate its siblings already had, and an explicit over-tier model override is refused instead of being honoured unchecked.
- [Agents now expose live operations APIs for analytics and intervention](https://speechify.ai/blog/agents-live-operations-apis): Speechify Agents added live transcript streaming, take-over actions, per-action RBAC, analytics queries, and saved dashboard APIs for monitoring live voice operations.
- [Build and Agents API fields moved toward one naming shape](https://speechify.ai/blog/api-field-naming-cleanup-2026-06-28): Build and Agents received a small API naming cleanup on June 28, including not_specified voice gender and several Agents field-name migrations.
- [API keys can now enforce monthly USD spend limits](https://speechify.ai/blog/api-key-monthly-spend-limits): Speechify API keys can now carry a monthly USD spend limit, returning 402 spend_cap_exceeded once a key reaches its budget for the calendar month.
- [API keys now carry clearer scopes and usage attribution](https://speechify.ai/blog/api-key-scopes-and-usage-attribution): Speechify API keys now have cleaner scope tiers, service-account inheritance, and usage attribution that makes spend easier to trace back to a workload.
- [Per-plan API rate and concurrency limits are now published](https://speechify.ai/blog/api-rate-and-concurrency-limits-published): The API limits reference now lists per-plan rate limits (requests per second, plus an Agents burst) and concurrency limits for both the TTS and Agents surfaces, and 429 responses carry a docs_url plus distinct rate_limited and concurrency_limited error codes.
- [The API now exposes more safety limits at the edge](https://speechify.ai/blog/api-safety-limits-and-request-boundaries): Speechify added rate-budget response headers, global JSON body-size handling, clearer 413 and 415 errors, and pre-auth IP throttling for token-mint paths.
- [TTS 404s now name the fix instead of a generic not-found](https://speechify.ai/blog/audio-404s-diagnosable-by-cause): POST /v1/audio/speech, /stream, and /stream/with-timestamps now return voice_not_found or a model-not-found message on a missing voice or model, instead of an opaque passthrough 404.
- [Best TTS Providers 2026: Comparison of the Top 10 APIs](https://speechify.ai/blog/best-tts-providers-2026-comparison): The top 10 text-to-speech APIs of 2026, benchmarked on the independent Artificial Analysis Speech Arena. Simba 3.2 is #1 on Artificial Analysis at $6 to $10 per million characters, above every ElevenLabs, Cartesia and Google model. Self-hosted models left out.
- [Best Voice Agent Platforms 2026: 9 Compared on Real All-In Cost](https://speechify.ai/blog/best-voice-agent-platforms-2026): The voice agent platforms developers actually evaluate in 2026, compared on what a minute really costs once the LLM, speech, and telephony are added. Most headline rates are platform fees, not bills. SpeechifyAI is all-in from $0.07/min.
- [Building an AI Voice Cloning Web App with Next.js and Speechify](https://speechify.ai/blog/building-an-ai-voice-cloning-web-app-with-nextjs-and-speechify): Clone a voice from a browser upload, synthesize speech with it, and keep your API key server-side. A working Next.js voice cloning app built on the Speechify API, no GPU required.
- [Building an automated audiobook pipeline with the Speechify TTS API](https://speechify.ai/blog/building-an-automated-audiobook-pipeline-with-the-speechify-tts-api): Turn long-form ePub or Markdown into a single narrated chapter MP3 with a runnable Python demo: chunk on sentence boundaries, synthesize each chunk, stitch with ffmpeg.
- [Building real-time captions with Speechify TTS speech marks](https://speechify.ai/blog/building-real-time-captions-with-speechify-tts-speech-marks): Use the Speechify API's word-level timestamps to generate accurate WebVTT captions for your synthesized audio.
- [Controlling Emotion and Timing in TTS with SSML](https://speechify.ai/blog/controlling-emotion-and-timing-in-tts-with-ssml): Use SSML emotion tags, pauses, prosody, emphasis, and pronunciation aliases to shape Speechify TTS output from one API request.
- [Dynamic video narration using the Speechify Voice Cloning API](https://speechify.ai/blog/dynamic-video-narration-using-the-speechify-voice-cloning-api): Clone a voice from a short sample and use it to narrate dynamic video content programmatically via the REST API.
- [SpeechifyAI and our elections](https://speechify.ai/blog/elections): The safeguards SpeechifyAI operates to prevent synthetic voices being used for election misinformation, and the commitments behind them.
- [Generating Audio Content at Scale in 2026: What an Hour Actually Costs](https://speechify.ai/blog/generating-audio-content-at-scale-2026): The tools for producing narration without hiring voice actors, compared on cost per finished hour rather than per seat. Studio subscriptions cap downloaded minutes; per-character APIs do not. One hour of audio runs from $0.31 to $40 depending on which you pick.
- [Hello Speechify Developers](https://speechify.ai/blog/hello-speechify-developers): Welcome to the new Speechify developer blog. Expect updates from the AI and labs teams, product news, collaborations, and technical guides for the Speechify TTS API.
- [How we think about latency in SpeechifyAI voice agents](https://speechify.ai/blog/how-we-think-about-latency-in-speechifyai-voice-agents): Baseten published a case study on the SpeechifyAI voice agent stack. This is our view on why model co-location matters for live calls.
- [Idempotency-Key is now wired across side-effect API calls](https://speechify.ai/blog/idempotency-key-for-side-effect-posts): Speechify now supports Idempotency-Key on the API calls most likely to be retried, including calls, batches, purchases, spend paths, and service-account key minting.
- [Launching the Speechify Cookbook](https://speechify.ai/blog/launching-the-speechify-cookbook): A small, public repo of runnable Speechify recipes. Pick a folder, drop in your API key, run it. TypeScript and Python today, SDK and native REST side by side.
- [List available TTS models at runtime with GET /v1/audio/models](https://speechify.ai/blog/list-tts-models-endpoint): A new GET /v1/audio/models endpoint returns the models you can pass as the model parameter, each with a default and recommended flag plus the languages it supports — so a model picker can be built at runtime instead of hardcoding the list.
- [Models list now reports per-model endpoints and curated-voice flag](https://speechify.ai/blog/models-endpoint-per-model-capabilities): GET /v1/audio/models now returns endpoints and curated_voices per model, so a model picker can show only valid synthesis routes and reject unsuitable voice selections before the request reaches the server.
- [Voice agents can now switch language mid-call](https://speechify.ai/blog/multilingual-voice-agents): One agent serves multiple languages in a single session, with no transfer and no dropped context - configure it with additional_languages.
- [Multilingual voiceover with the Speechify API and simba-3.0](https://speechify.ai/blog/multilingual-voiceover-with-speechify-and-simba-3-0): Generate the same script in English, German, Spanish, French, Italian, and Portuguese with the Speechify TTS API. Pick a simba-3.0 voice for each locale, call POST /v1/audio/speech per language, keep the key server-side.
- [Set a per-agent maximum call duration](https://speechify.ai/blog/per-agent-max-call-duration): Voice agents now carry a max_call_duration_seconds field — a hard per-agent wall-clock cap on a single call. When a call reaches it, the agent ends automatically; null keeps the previous behavior of bounding calls only by your plan's ceiling.
- [Service accounts are now machine identities for the Speechify API](https://speechify.ai/blog/service-accounts-for-api-keys): Service accounts give Speechify API workloads their own identity, scope ceiling, key rotation flow, usage attribution, and short-lived child keys for agent sessions.
- [Simba 3.0 now supports cloned and personal voices](https://speechify.ai/blog/simba-3-0-cloned-voices): simba-3.0 accepts cloned and personal voice_id values self-serve on POST /v1/audio/speech and /v1/audio/stream, the same way simba-english does; simba-3.2 cloning still requires manual approval.
- [Simba 3.0 now speaks six European languages; Simba 1.6 marked legacy](https://speechify.ai/blog/simba-3-0-multilingual-and-legacy-models): Simba 3.0 is no longer English-only — it now officially covers English plus German, Spanish (ES/MX), French, Italian, and Brazilian Portuguese. The same release flags the Simba 1.6 models as legacy and confirms Simba 3.0 accepts cloned voices.
- [simba-3.0 is now the default TTS model](https://speechify.ai/blog/simba-3-0-new-default-tts-model): Requests that omit model now resolve to simba-3.0 instead of simba-english. Nothing you already send changes shape, and nothing that worked starts failing.
- [Simba 3.2 is our recommended TTS model: what changed and how to migrate](https://speechify.ai/blog/simba-3-2-and-the-models-endpoint): simba-3.2 is now the recommended Speechify TTS model, and GET /v1/audio/models lets you discover it at runtime instead of hardcoding a model list. What shipped, the voice allow-list, and how to move off simba-3.0.
- [Cloned voices on simba-3.2 now enabled per workspace](https://speechify.ai/blog/simba-3-2-cloning-workspace-enablement): Voice cloning on simba-3.2 moved from per-voice approval to per-workspace enablement. Once your workspace is enabled, every clone you own works on the model.
- [Simba 3.2 is live on the TTS API as the recommended English model](https://speechify.ai/blog/simba-3-2-streaming-model): Simba 3.2 is now available on POST /v1/audio/speech and /v1/audio/stream — a streaming-native Simba 3 model with lower TTFB, richer expressivity, and a curated voice allow-list, recommended for new English integrations.
- [Cloned voices can now run on Simba 3.2 with Speechify approval](https://speechify.ai/blog/simba-3-2-voice-cloning-approval): Personal cloned voices can now be synthesized on the curated Simba 3.2 model. Given the model's quality bar, each clone is gated on manual Speechify approval of the voice key, while simba-english and simba-multilingual keep serving clones self-serve.
- [WE'RE NUMBER ONE](https://speechify.ai/blog/simba-3-tops-artificial-analysis-tts-leaderboard): Simba 3.2 is #1 on Artificial Analysis, the independent TTS benchmark. On Voice Arena's blind, listener-voted board it's the #1 real-time voice and #1 on price — the model above it isn't real-time, the nearest at its quality costs 7x more. Nothing you can ship beats it.
- [Speech generation in the Vercel AI SDK with Speechify](https://speechify.ai/blog/speech-generation-in-the-vercel-ai-sdk-with-speechify): The AI SDK ships generateSpeech() but no Speechify provider. So we wrote one: a dependency-free custom speech model that maps POST /v1/audio/speech onto the SDK's SpeechModelV4 interface, key held server-side in a Next.js route.
- [Every public API header now has one canonical, un-prefixed name](https://speechify.ai/blog/speechify-header-namespace): Speechify-Request-Id and RateLimit-* are now the canonical header names across the public API; the old X-prefixed spellings keep working until 2027-07-24.
- [Switch to Speechify from inside speech-sdk](https://speechify.ai/blog/speechify-speech-sdk-provider): Speechify is now a direct provider in speech-sdk. Switch existing calls over with a factory function and an API key, no new client required.
- [Speechify-Version gives API clients a stable date pin](https://speechify.ai/blog/speechify-version-api-date-pinning): Speechify APIs now support the Speechify-Version header, so HTTP clients can pin a dated contract while SDKs send their build-date version automatically.
- [Streaming TTS in Python with Speechify](https://speechify.ai/blog/streaming-tts-in-python-with-speechify): How to stream audio from the Speechify TTS API in Python using the SDK and native requests. Covers chunked streaming to disk and piping audio to a player without waiting for the full payload.
- [Streaming TTS directly to the browser with Web Audio API](https://speechify.ai/blog/streaming-tts-to-the-browser-with-web-audio-api): Stream Speechify TTS as raw PCM, keep the API key server-side, and schedule each chunk into the browser's Web Audio API for low-latency playback.
- [Text-to-Speech for Customer Support Chatbots: How to Choose](https://speechify.ai/blog/text-to-speech-for-customer-support-chatbots): Which speech platform to pick when your chatbot has to talk. The decision is not voice quality, it is whether you need a TTS API or a full voice agent, plus how the model reads account numbers and order IDs back to a caller.
- [Free tier TTS requests get a burst allowance](https://speechify.ai/blog/tts-free-tier-burst-allowance): Free-tier /v1/audio/* requests get a 10-request burst bucket instead of capping at the 1 req/s sustained rate, so a first quickstart script no longer 429s on its second call.
- [TTS now accepts sample-rate and bitrate-specific output formats](https://speechify.ai/blog/tts-output-format-sample-rate-bitrate): Speechify TTS speech and streaming endpoints now accept output_format values like pcm_16000, ulaw_8000, and bitrate-tuned mp3 variants without changing existing callers.
- [TTS stream responses are documented as raw audio streams](https://speechify.ai/blog/tts-stream-response-behavior-clarified): The Build docs now spell out that POST /v1/audio/stream returns chunked raw audio, not JSON, with clearer response content types and codec notes.
- [Streaming TTS now carries word-level speech marks](https://speechify.ai/blog/tts-stream-with-timestamps): A new endpoint streams speech marks alongside audio, so captions and text highlighting no longer need the non-streamed API.
- [Using TTS in Node.js with Speechify](https://speechify.ai/blog/using-tts-in-nodejs-with-speechify): A practical guide to synthesizing speech in Node.js using the Speechify TTS API. Covers installation, a basic synthesis call, streaming audio to disk, and what to reach for next.
- [Voice Agent Tool Calls: What to Run Inline and What to Hand Off](https://speechify.ai/blog/voice-agent-tool-calls-inline-vs-handoff): A voice agent's tool call happens inside a turn the caller is waiting through, which makes it a latency decision before it is an architecture one. The rule: reads that return fast run inline, writes and slow lookups get a receipt and finish asynchronously.
- [Voice Agents API is now public beta](https://speechify.ai/blog/voice-agents-api-public-beta): Speechify Voice Agents is now publicly documented, with guides and API reference pages for agents, conversations, tools, knowledge bases, calls, and monitoring.
- [Voice cloning now verifies the speaker's consent](https://speechify.ai/blog/voice-cloning-verified-consent): Creating a cloned voice now requires the speaker to read a Speechify-issued phrase aloud, checked and retained as the consent record. The old consent JSON flow is deprecated today and will be switched off after a short migration window.
- [Filter GET /v1/voices by type, locale, gender, and model](https://speechify.ai/blog/voices-list-filtering): GET /v1/voices now accepts type, locale, gender, and model query filters, applied before pagination so pages stay full — so you can fetch, say, only English cloned voices that support Simba 3.2 in a single call.
- [GET /v1/voices now returns a pagination-ready envelope](https://speechify.ai/blog/voices-list-pagination-envelope): The Build API moved GET /v1/voices from a bare array to a voices object with pagination fields, making the response shape safer for SDKs and future growth.
- [What Ecommerce Support Calls Actually Cost](https://speechify.ai/blog/what-ecommerce-support-calls-actually-cost): The three ways an ecommerce brand answers the phone, normalized to cost per talk minute so they are comparable. Outsourced call centers run $0.35 to $1.35 a minute and voice agents run under $0.08 all-in, but containment rate decides more than either number.
- [Widget bundle compression and session spend-limit 402](https://speechify.ai/blog/widget-bundle-compression-session-402): The voice-agent widget is now served compressed - 676 kB down to 190 kB when it was measured - supports version-pinned URLs with subresource integrity, and session creation returns 402 when a spend limit or budget is hit rather than a 500.
- [Widget now served from cdn.speechify.ai; new flow_budget_exhausted call end reason](https://speechify.ai/blog/widget-cdn-flow-budget-exhausted): New widget embeds load from cdn.speechify.ai - a floating URL that tracks the current release, plus immutable version pins for change-controlled sites - and the Conversation resource's end_reason field now documents flow_budget_exhausted, a runtime backstop for looping calls.
- [Widget error reporting and startAgent connect-failure contract](https://speechify.ai/blog/widget-error-codes-and-startagent-behavior): The voice-agent widget now reports real failure codes on widget.error instead of always-unknown, and startAgent() connect failures arrive on the promise rejection rather than duplicating across onError and the rejection channel.
- [Workspace webhooks now have endpoint management and versioned payloads](https://speechify.ai/blog/workspace-webhooks-event-catalog-and-versioned-payloads): Speechify workspace webhooks now support managed endpoints, delivery history, a resource.action event catalog, combined signatures, and per-endpoint API versions.
- [Luke Oliff — Developer Relations · SpeechifyAI Labs](https://speechify.ai/blog/author/luke): Luke Oliff is a Developer Relations leader based in the UK. For the better part of a decade he has been working with voice technology, developer tooling, and open-source — improving developer experience for well known brands. He has architected open-source strategy, launched developer communities, built tools, and shipped conversational AI voice prototypes years before mainstream APIs were available. As an engineer at heart, he writes and speaks about voice AI, developer experience, and real-time APIs as a developer would, focussing on utility and experience. He has now joined the SpeechifyAI Labs team, where Simba 3.2 sits at #1 on the independent Artificial Analysis TTS leaderboard and ranks as the #1 real-time voice on Voice Arena — the best-sounding real-time voice at its price.
- [Vrishab Nair — GTM Engineering · SpeechifyAI](https://speechify.ai/blog/author/vrishab): Vrishab Nair is a GTM engineer at SpeechifyAI, working on the go-to-market side of the developer platform: the tooling that connects the API to the people building on it. He writes about voice AI the way a buyer evaluates it: cost per minute, time to first byte, and whether the published numbers survive contact with a real workload.
- [Posts tagged "tts"](https://speechify.ai/blog/tag/tts): All blog posts tagged "tts" on speechify.ai (27 posts).
- [Posts tagged "api"](https://speechify.ai/blog/tag/api): All blog posts tagged "api" on speechify.ai (17 posts).
- [Posts tagged "javascript"](https://speechify.ai/blog/tag/javascript): All blog posts tagged "javascript" on speechify.ai (1 post).
- [Posts tagged "mobile"](https://speechify.ai/blog/tag/mobile): All blog posts tagged "mobile" on speechify.ai (1 post).
- [Posts tagged "streaming"](https://speechify.ai/blog/tag/streaming): All blog posts tagged "streaming" on speechify.ai (7 posts).
- [Posts tagged "tutorial"](https://speechify.ai/blog/tag/tutorial): All blog posts tagged "tutorial" on speechify.ai (1 post).
- [Posts tagged "web-speech-api"](https://speechify.ai/blog/tag/web-speech-api): All blog posts tagged "web-speech-api" on speechify.ai (1 post).
- [Posts tagged "deepgram"](https://speechify.ai/blog/tag/deepgram): All blog posts tagged "deepgram" on speechify.ai (4 posts).
- [Posts tagged "voice-agents"](https://speechify.ai/blog/tag/voice-agents): All blog posts tagged "voice-agents" on speechify.ai (15 posts).
- [Posts tagged "go"](https://speechify.ai/blog/tag/go): All blog posts tagged "go" on speechify.ai (1 post).
- [Posts tagged "byoc"](https://speechify.ai/blog/tag/byoc): All blog posts tagged "byoc" on speechify.ai (1 post).
- [Posts tagged "multilingual"](https://speechify.ai/blog/tag/multilingual): All blog posts tagged "multilingual" on speechify.ai (4 posts).
- [Posts tagged "share-links"](https://speechify.ai/blog/tag/share-links): All blog posts tagged "share-links" on speechify.ai (1 post).
- [Posts tagged "beta"](https://speechify.ai/blog/tag/beta): All blog posts tagged "beta" on speechify.ai (1 post).
- [Posts tagged "voice-cloning"](https://speechify.ai/blog/tag/voice-cloning): All blog posts tagged "voice-cloning" on speechify.ai (9 posts).
- [Posts tagged "pagination"](https://speechify.ai/blog/tag/pagination): All blog posts tagged "pagination" on speechify.ai (2 posts).
- [Posts tagged "agents"](https://speechify.ai/blog/tag/agents): All blog posts tagged "agents" on speechify.ai (9 posts).
- [Posts tagged "test-runs"](https://speechify.ai/blog/tag/test-runs): All blog posts tagged "test-runs" on speechify.ai (1 post).
- [Posts tagged "spend-limits"](https://speechify.ai/blog/tag/spend-limits): All blog posts tagged "spend-limits" on speechify.ai (3 posts).
- [Posts tagged "analytics"](https://speechify.ai/blog/tag/analytics): All blog posts tagged "analytics" on speechify.ai (1 post).
- [Posts tagged "live-calls"](https://speechify.ai/blog/tag/live-calls): All blog posts tagged "live-calls" on speechify.ai (1 post).
- [Posts tagged "operations"](https://speechify.ai/blog/tag/operations): All blog posts tagged "operations" on speechify.ai (1 post).
- [Posts tagged "api-versioning"](https://speechify.ai/blog/tag/api-versioning): All blog posts tagged "api-versioning" on speechify.ai (3 posts).
- [Posts tagged "sdk"](https://speechify.ai/blog/tag/sdk): All blog posts tagged "sdk" on speechify.ai (3 posts).
- [Posts tagged "build"](https://speechify.ai/blog/tag/build): All blog posts tagged "build" on speechify.ai (1 post).
- [Posts tagged "api-keys"](https://speechify.ai/blog/tag/api-keys): All blog posts tagged "api-keys" on speechify.ai (3 posts).
- [Posts tagged "billing"](https://speechify.ai/blog/tag/billing): All blog posts tagged "billing" on speechify.ai (2 posts).
- [Posts tagged "security"](https://speechify.ai/blog/tag/security): All blog posts tagged "security" on speechify.ai (4 posts).
- [Posts tagged "usage"](https://speechify.ai/blog/tag/usage): All blog posts tagged "usage" on speechify.ai (1 post).
- [Posts tagged "scopes"](https://speechify.ai/blog/tag/scopes): All blog posts tagged "scopes" on speechify.ai (1 post).
- [Posts tagged "api-reference"](https://speechify.ai/blog/tag/api-reference): All blog posts tagged "api-reference" on speechify.ai (7 posts).
- [Posts tagged "rate-limits"](https://speechify.ai/blog/tag/rate-limits): All blog posts tagged "rate-limits" on speechify.ai (3 posts).
- [Posts tagged "errors"](https://speechify.ai/blog/tag/errors): All blog posts tagged "errors" on speechify.ai (3 posts).
- [Posts tagged "api-hardening"](https://speechify.ai/blog/tag/api-hardening): All blog posts tagged "api-hardening" on speechify.ai (1 post).
- [Posts tagged "comparison"](https://speechify.ai/blog/tag/comparison): All blog posts tagged "comparison" on speechify.ai (4 posts).
- [Posts tagged "artificial-analysis"](https://speechify.ai/blog/tag/artificial-analysis): All blog posts tagged "artificial-analysis" on speechify.ai (2 posts).
- [Posts tagged "benchmarks"](https://speechify.ai/blog/tag/benchmarks): All blog posts tagged "benchmarks" on speechify.ai (2 posts).
- [Posts tagged "pricing"](https://speechify.ai/blog/tag/pricing): All blog posts tagged "pricing" on speechify.ai (5 posts).
- [Posts tagged "simba"](https://speechify.ai/blog/tag/simba): All blog posts tagged "simba" on speechify.ai (8 posts).
- [Posts tagged "elevenlabs"](https://speechify.ai/blog/tag/elevenlabs): All blog posts tagged "elevenlabs" on speechify.ai (3 posts).
- [Posts tagged "vapi"](https://speechify.ai/blog/tag/vapi): All blog posts tagged "vapi" on speechify.ai (1 post).
- [Posts tagged "retell"](https://speechify.ai/blog/tag/retell): All blog posts tagged "retell" on speechify.ai (1 post).
- [Posts tagged "nextjs"](https://speechify.ai/blog/tag/nextjs): All blog posts tagged "nextjs" on speechify.ai (3 posts).
- [Posts tagged "typescript"](https://speechify.ai/blog/tag/typescript): All blog posts tagged "typescript" on speechify.ai (6 posts).
- [Posts tagged "audiobooks"](https://speechify.ai/blog/tag/audiobooks): All blog posts tagged "audiobooks" on speechify.ai (2 posts).
- [Posts tagged "python"](https://speechify.ai/blog/tag/python): All blog posts tagged "python" on speechify.ai (2 posts).
- [Posts tagged "pipeline"](https://speechify.ai/blog/tag/pipeline): All blog posts tagged "pipeline" on speechify.ai (1 post).
- [Posts tagged "speech-marks"](https://speechify.ai/blog/tag/speech-marks): All blog posts tagged "speech-marks" on speechify.ai (2 posts).
- [Posts tagged "captions"](https://speechify.ai/blog/tag/captions): All blog posts tagged "captions" on speechify.ai (1 post).
- [Posts tagged "accessibility"](https://speechify.ai/blog/tag/accessibility): All blog posts tagged "accessibility" on speechify.ai (1 post).
- [Posts tagged "webvtt"](https://speechify.ai/blog/tag/webvtt): All blog posts tagged "webvtt" on speechify.ai (1 post).
- [Posts tagged "ssml"](https://speechify.ai/blog/tag/ssml): All blog posts tagged "ssml" on speechify.ai (2 posts).
- [Posts tagged "emotion"](https://speechify.ai/blog/tag/emotion): All blog posts tagged "emotion" on speechify.ai (1 post).
- [Posts tagged "video"](https://speechify.ai/blog/tag/video): All blog posts tagged "video" on speechify.ai (1 post).
- [Posts tagged "rest-api"](https://speechify.ai/blog/tag/rest-api): All blog posts tagged "rest-api" on speechify.ai (1 post).
- [Posts tagged "safety"](https://speechify.ai/blog/tag/safety): All blog posts tagged "safety" on speechify.ai (1 post).
- [Posts tagged "elections"](https://speechify.ai/blog/tag/elections): All blog posts tagged "elections" on speechify.ai (1 post).
- [Posts tagged "policy"](https://speechify.ai/blog/tag/policy): All blog posts tagged "policy" on speechify.ai (1 post).
- [Posts tagged "narration"](https://speechify.ai/blog/tag/narration): All blog posts tagged "narration" on speechify.ai (1 post).
- [Posts tagged "announcement"](https://speechify.ai/blog/tag/announcement): All blog posts tagged "announcement" on speechify.ai (1 post).
- [Posts tagged "developer-experience"](https://speechify.ai/blog/tag/developer-experience): All blog posts tagged "developer-experience" on speechify.ai (6 posts).
- [Posts tagged "partnership"](https://speechify.ai/blog/tag/partnership): All blog posts tagged "partnership" on speechify.ai (1 post).
- [Posts tagged "baseten"](https://speechify.ai/blog/tag/baseten): All blog posts tagged "baseten" on speechify.ai (1 post).
- [Posts tagged "latency"](https://speechify.ai/blog/tag/latency): All blog posts tagged "latency" on speechify.ai (3 posts).
- [Posts tagged "idempotency"](https://speechify.ai/blog/tag/idempotency): All blog posts tagged "idempotency" on speechify.ai (1 post).
- [Posts tagged "api-reliability"](https://speechify.ai/blog/tag/api-reliability): All blog posts tagged "api-reliability" on speechify.ai (1 post).
- [Posts tagged "cookbook"](https://speechify.ai/blog/tag/cookbook): All blog posts tagged "cookbook" on speechify.ai (1 post).
- [Posts tagged "models"](https://speechify.ai/blog/tag/models): All blog posts tagged "models" on speechify.ai (7 posts).
- [Posts tagged "simba-3.0"](https://speechify.ai/blog/tag/simba-3.0): All blog posts tagged "simba-3.0" on speechify.ai (1 post).
- [Posts tagged "service-accounts"](https://speechify.ai/blog/tag/service-accounts): All blog posts tagged "service-accounts" on speechify.ai (1 post).
- [Posts tagged "changelog"](https://speechify.ai/blog/tag/changelog): All blog posts tagged "changelog" on speechify.ai (1 post).
- [Posts tagged "simba-3.2"](https://speechify.ai/blog/tag/simba-3.2): All blog posts tagged "simba-3.2" on speechify.ai (1 post).
- [Posts tagged "voice-arena"](https://speechify.ai/blog/tag/voice-arena): All blog posts tagged "voice-arena" on speechify.ai (1 post).
- [Posts tagged "launch"](https://speechify.ai/blog/tag/launch): All blog posts tagged "launch" on speechify.ai (1 post).
- [Posts tagged "vercel"](https://speechify.ai/blog/tag/vercel): All blog posts tagged "vercel" on speechify.ai (1 post).
- [Posts tagged "ai-sdk"](https://speechify.ai/blog/tag/ai-sdk): All blog posts tagged "ai-sdk" on speechify.ai (1 post).
- [Posts tagged "headers"](https://speechify.ai/blog/tag/headers): All blog posts tagged "headers" on speechify.ai (1 post).
- [Posts tagged "platform"](https://speechify.ai/blog/tag/platform): All blog posts tagged "platform" on speechify.ai (1 post).
- [Posts tagged "speech-sdk"](https://speechify.ai/blog/tag/speech-sdk): All blog posts tagged "speech-sdk" on speechify.ai (1 post).
- [Posts tagged "text-to-speech"](https://speechify.ai/blog/tag/text-to-speech): All blog posts tagged "text-to-speech" on speechify.ai (1 post).
- [Posts tagged "integrations"](https://speechify.ai/blog/tag/integrations): All blog posts tagged "integrations" on speechify.ai (1 post).
- [Posts tagged "browser"](https://speechify.ai/blog/tag/browser): All blog posts tagged "browser" on speechify.ai (1 post).
- [Posts tagged "webaudio"](https://speechify.ai/blog/tag/webaudio): All blog posts tagged "webaudio" on speechify.ai (1 post).
- [Posts tagged "customer-support"](https://speechify.ai/blog/tag/customer-support): All blog posts tagged "customer-support" on speechify.ai (2 posts).
- [Posts tagged "free-tier"](https://speechify.ai/blog/tag/free-tier): All blog posts tagged "free-tier" on speechify.ai (1 post).
- [Posts tagged "audio-format"](https://speechify.ai/blog/tag/audio-format): All blog posts tagged "audio-format" on speechify.ai (1 post).
- [Posts tagged "telephony"](https://speechify.ai/blog/tag/telephony): All blog posts tagged "telephony" on speechify.ai (1 post).
- [Posts tagged "nodejs"](https://speechify.ai/blog/tag/nodejs): All blog posts tagged "nodejs" on speechify.ai (1 post).
- [Posts tagged "tool-calling"](https://speechify.ai/blog/tag/tool-calling): All blog posts tagged "tool-calling" on speechify.ai (1 post).
- [Posts tagged "webhooks"](https://speechify.ai/blog/tag/webhooks): All blog posts tagged "webhooks" on speechify.ai (2 posts).
- [Posts tagged "mcp"](https://speechify.ai/blog/tag/mcp): All blog posts tagged "mcp" on speechify.ai (1 post).
- [Posts tagged "architecture"](https://speechify.ai/blog/tag/architecture): All blog posts tagged "architecture" on speechify.ai (1 post).
- [Posts tagged "public-beta"](https://speechify.ai/blog/tag/public-beta): All blog posts tagged "public-beta" on speechify.ai (1 post).
- [Posts tagged "deprecation"](https://speechify.ai/blog/tag/deprecation): All blog posts tagged "deprecation" on speechify.ai (1 post).
- [Posts tagged "voices"](https://speechify.ai/blog/tag/voices): All blog posts tagged "voices" on speechify.ai (2 posts).
- [Posts tagged "ecommerce"](https://speechify.ai/blog/tag/ecommerce): All blog posts tagged "ecommerce" on speechify.ai (1 post).
- [Posts tagged "retail"](https://speechify.ai/blog/tag/retail): All blog posts tagged "retail" on speechify.ai (1 post).
- [Posts tagged "cost-analysis"](https://speechify.ai/blog/tag/cost-analysis): All blog posts tagged "cost-analysis" on speechify.ai (1 post).
- [Posts tagged "widget"](https://speechify.ai/blog/tag/widget): All blog posts tagged "widget" on speechify.ai (3 posts).
- [Posts tagged "cdn"](https://speechify.ai/blog/tag/cdn): All blog posts tagged "cdn" on speechify.ai (1 post).
- [Posts tagged "conversations"](https://speechify.ai/blog/tag/conversations): All blog posts tagged "conversations" on speechify.ai (1 post).
- [Posts tagged "bugfix"](https://speechify.ai/blog/tag/bugfix): All blog posts tagged "bugfix" on speechify.ai (1 post).