Engineering and research · SpeechifyAI
The SpeechifyAI team builds the Simba text-to-speech models and the API that serves them. Posts under this byline are written and reviewed by the team, with every figure read from its source on the date shown.
Simba 3.5 is SpeechifyAI's recommended text-to-speech model from 21 October 2026: 48 languages under one model id, simba-3.5, on every plan and every synthesis endpoint. The request, the languages, the price and how to switch from Simba 3.2.
SpeechifyAI team
SpeechifyAI's text-to-speech API takes an optional safety_identifier, a keyed hash of your own user id, so one end user can be limited or blocked while the rest of your workspace keeps working. On 13 October 2026, seven other TTS APIs documented no way to do that.
SpeechifyAI team
Since 9 October 2026, SpeechifyAI takes an LLM's reply over a WebSocket as it is written. From Google Cloud us-east4 that day, the first word was audible 49 ms after the LLM finished its first sentence, against 68 ms with one HTTP request per sentence.
SpeechifyAI team
On 1 October 2026, SpeechifyAI's $10 Starter plan allowed 15 concurrent text-to-speech requests and its $99 Pro plan 30. Concurrency and rate limits for 14 text-to-speech APIs, plan by plan, read from each provider's own pages that day.
SpeechifyAI team
LiveKit's Speechify plugins, for Python and Node.js, add Speechify TTS to an AgentSession in one line. The Python plugin streams each sentence: 98 ms median to first audible audio from US East on 12 Oct 2026.
SpeechifyAI team
In our own round on 9 October 2026, Simba 3.2 reached first audible audio in a median of 47 ms from US East, the lowest of the 13 streaming endpoints we timed. What to measure before you pick a TTS API for a voice agent, and what cuts the wait.
SpeechifyAI team
Coval's independent benchmark measured Simba 3.2's median time to first audio at 379 ms on 13 September 2026 and 106 ms on 24 September, with the same model. What changed, why Coval counts leading silence, and how to reproduce it.
SpeechifyAI team
Monthly cost of 13 text-to-speech APIs at 1M, 10M and 100M characters, subscription fees included, read from each vendor's pricing page on 28 September 2026, next to each model's blind-listening score.
SpeechifyAI team
There's now a command line for Speechify. Install it from npm, log in with your API key, and synthesize speech, browse voices, and hand Speechify to your AI agent, all from your terminal.
SpeechifyAI teamFirst published by Luke Oliff
Speechify's official LiveKit plugin streams word-level timestamps alongside the audio. Read them by overriding transcription_node and you get word-synced captions in a Python voice agent, with no extra API calls.
SpeechifyAI teamFirst published by Luke Oliff
Add a listen button to documentation with the Speechify API. A framework-agnostic walkthrough with a concrete example you can copy.
SpeechifyAI teamFirst published by Luke Oliff
What streaming text-to-speech makes possible: read-aloud, voice agents, call narration, live captions, and read-along highlighting, all built on the Speechify streaming endpoints.
SpeechifyAI teamFirst published by Luke Oliff
Turn an RSS feed into a daily audio digest with the Speechify API. Fetch items, join the text, generate one audio file, and deliver it.
SpeechifyAI teamFirst published by Luke Oliff
Build a Slack bot that reads channel messages aloud with the Speechify API. Wire events, synthesize audio, and post the clip back to the channel.
SpeechifyAI teamFirst published by Luke Oliff
Give the Speechify text-to-speech API a URL and the page comes back as narrated audio. Fetch, extract the article text, chunk on sentence boundaries, synthesize each chunk with POST /v1/audio/speech.
SpeechifyAI teamFirst published by Luke Oliff
The safeguards SpeechifyAI operates to prevent synthetic voices being used for election misinformation, and the commitments behind them.
SpeechifyAI teamFirst published by Luke Oliff
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.
SpeechifyAI teamFirst published by Luke Oliff
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.
SpeechifyAI teamFirst published by Luke Oliff
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.
SpeechifyAI teamFirst published by Luke Oliff
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.
SpeechifyAI teamFirst published by Luke Oliff
How a Speechify provider for the AI SDK's generateSpeech() works: a dependency-free speech model that maps POST /v1/audio/speech onto SpeechModelV4, key held server-side in a Next.js route. Speechify now maintains one on npm, @speechify/ai-sdk-provider.
SpeechifyAI teamFirst published by Luke Oliff
Simba 3.2 for voice agents and narration at volume: 47 ms to first audible audio from US East on 9 October 2026, and $10 per 1M characters, $6 on Scale. Simba 3.5 (21 October 2026) speaks 48 languages with every catalog voice.
SpeechifyAI teamFirst published by Luke Oliff
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.
SpeechifyAI teamFirst published by Luke Oliff
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.
SpeechifyAI teamFirst published by Luke Oliff
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.
SpeechifyAI teamFirst published by Luke Oliff
Use SSML pauses, speaking rate, and pronunciation aliases to shape Speechify TTS output from one API request, and know which tags current models apply.
SpeechifyAI teamFirst published by Luke Oliff
On the Artificial Analysis Speech Arena on 13 October 2026, Simba 3.2 scored 1,244 and was the lowest-priced model in the top ten, at $6.60 per million characters against $11 for the next. How the board's Elo works, and two independent latency readings.
SpeechifyAI teamFirst published by Luke Oliff
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.
SpeechifyAI teamFirst published by Luke Oliff
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.
SpeechifyAI teamFirst published by Luke Oliff
Clone a voice from a short sample and use it to narrate dynamic video content programmatically via the REST API.
SpeechifyAI teamFirst published by Luke Oliff
Use the Speechify API's word-level timestamps to generate accurate WebVTT captions for your synthesized audio.
SpeechifyAI teamFirst published by Luke Oliff
How to stream audio from the Speechify TTS API in Python with plain HTTP and requests. Covers chunked streaming to disk and piping audio to a player without waiting for the full payload.
SpeechifyAI teamFirst published by Luke Oliff
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.
SpeechifyAI teamFirst published by Luke Oliff
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