SpeechifyAI vs 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 with the LLM included, plus a workflow editor, tool calling, evals, and governance, quoted per contract.

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SpeechifyAI

Vapi

SpeechifyAI at a glance

all-in, LLM included: One rate
volume agreed up front: Per contract
+ webhooks: Tool calling
Type II certified: SOC 2

SpeechifyAI vs Vapi, capability by capability
Capability	SpeechifyAI	Vapi
Pricing	Quoted per contract, all-in with the LLM included	$0.05/min platform + STT/LLM/TTS passthrough (~$0.10–0.20 all-in)
What's included	LLM + STT + TTS + orchestration in one rate	Orchestration only; bring and pay for the rest
Free tier	Pilot scoped with our team	Build plan: 60+ minutes included, then usage-based
Workflow design	Visual + code, deterministic branching	Code-first with function calling
Integrations	Tool calling + webhooks	Bring-your-own via functions
Evals / tests	Simulated callers, regression suites	Manual or bring-your-own
Enterprise controls	SSO, RBAC, encryption	HIPAA $2,000/mo, zero-retention $1,000/mo add-ons

SpeechifyAI vs Vapi, in plain English

The whole stack runs on day one

Vapi gives you an API to glue voice agents together at $0.05 a minute for hosting plus whatever your model provider charges on top, with $10 per phone line per month. The Build plan ships without SSO, RBAC, SOC 2 reports, or an SLA, and compliance is sold separately at $2,000 a month for HIPAA and $1,000 a month for zero data retention. SpeechifyAI rolls all of that into a a single all-in per-minute rate, quoted per contract that covers the LLM, the speech stack, the workflow runtime, tool calling, webhooks, and SOC 2 Type II compliance without the per-feature procurement add-ons.

Tests built for voice, not borrowed from web apps

A voice agent breaks in ways a unit test cannot catch: callers talk over the agent, wait too long, or ask the same thing two different ways inside two seconds. SpeechifyAI ships simulated callers as a first-class feature so a regression hits the test runner instead of a real customer, and the visual workflow editor lets a non-engineer trace exactly which branch each recorded call took. Vapi leaves that whole layer for you to build; doing it well is a quarter of engineering work.

The verdict

SpeechifyAI gives engineering teams a production voice-agent stack pre-wired in one all-in rate, with SOC 2 Type II, SSO, RBAC, telephony, and integrations built in rather than bolted on as separate compliance line items.

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