Vapi

Developer platform for building, testing, and deploying voice AI agents that handle phone calls.

Pricing Pay-per-minute from $0.05/min / Enterprise custom

Category Voice AI & Agents

Quick take

Vapi is the most flexible voice AI platform for developers who want control over every layer of the stack. If you know what LLM, TTS, and STT providers you want and you need real-time voice orchestration, Vapi is the right starting point. If you want an opinionated, works-out-of-the-box solution, Bland.ai or Retell AI are simpler choices.

Trusted by

Amazon Ring

Intuit

New York Life

ServiceTitan

Kavak

Vapi scorecard

How we grade

B+ 84/100

Overall grade

Well-funded with credible enterprise traction and a genuine product, but it is developer infrastructure, not a turnkey meetings tool, and headline pricing understates the true cost.

Idea A Voice-AI infrastructure is a real, large, fast-growing category with a clear developer wedge.

Brand B+ Strong in developer circles (VapiCon, active community), but near-zero third-party review presence.

Product A- Flexible, provider-agnostic, and battle-tested at 1B+ calls; stability and update-regression complaints recur.

Market fit A Amazon Ring choosing Vapi over 40 rivals plus enterprise logos is strong demand validation.

Adoption A- 1M+ developers and 1B+ calls is large, though the figures are self-reported.

Features A- Telephony, SDKs, model routing, and tooling are broad; the non-developer UX is a gap.

Security B SOC 2, HIPAA, and data residency are claimed but enterprise-gated and unverified in scope.

Value B A cheap headline ($0.05/min platform fee), but real all-in cost is $0.15-0.40/min once providers are added.

Overview

Vapi is a developer platform for building voice AI agents that can make and receive phone calls, join meetings, and hold natural conversations. Think of it as the Twilio for voice AI: you define what the agent should say and do, pick your LLM, TTS, and STT providers, and Vapi handles the real-time orchestration. The platform has raised $40M and is growing fast in the voice AI space, competing with Retell AI and Bland.ai for developer mindshare.

Strengths & limitations

Strengths

+Best-in-class developer experience
+Very low latency for natural conversations
+Flexible provider choices for each component

Limitations

–Per-minute costs add up at scale
–Requires development skills
–Phone-focused, less suited for in-meeting use

Pricing

Pay-per-minute from $0.05minEnterprise custom

Usage-based: ~$0.05/min for Vapi orchestration, plus pass-through costs for your chosen LLM, TTS, and STT providers. A typical stack (GPT-4o + ElevenLabs + Deepgram) costs roughly $0.10-0.15/min all-in. Free tier available for development and testing.

Who it's for

Developers building voice AI agents for customer service, appointment booking, lead qualification, or outbound calling. Teams that want control over their AI stack (choose your own LLM/TTS/STT) rather than an opinionated, closed platform. Not for non-technical teams; this is a developer tool.