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Vapi

Developer API platform for building AI voice agents with real-time speech-to-speech latency and any LLM backend.

Listed Needs re-verification
Voice Contact Center $ Small business Mid-market Technology

What it does

Vapi is a developer-first API platform for building AI voice agents - providing low-latency speech-to-speech infrastructure that handles voice activity detection, transcription, LLM integration, and text-to-speech synthesis so developers can build phone-based AI agents without managing audio pipelines. AI capabilities include real-time voice conversation with sub-500ms latency for natural-feeling interactions, bring-your-own-LLM flexibility supporting OpenAI, Anthropic, and custom models, customizable voice synthesis via ElevenLabs and other TTS providers, function calling that enables voice agents to take actions during conversations, call recording and transcription, and webhook events for integrating voice agent outcomes into downstream systems.

Strengths

  • Mid-market companies use Vapi to build internal and customer-facing AI voice agents at scale - flexible LLM and voice provider choices enabling custom agent experiences.
  • Small AI teams use Vapi for production voice applications - managed infrastructure reducing engineering effort for AI phone agent deployment.
  • Individual developers use Vapi to prototype AI voice agents - low-code API enabling voice agent experimentation without audio infrastructure expertise.

Watch-outs

  • Developer API — not a no-code voice agent builder: Vapi requires coding to build agents — non-technical teams need a developer or should use no-code voice agent platforms like Synthflow instead.
  • Competes with Bland AI and Retell AI for voice agent APIs: Bland AI and Retell AI offer competing voice agent APIs — developers should compare latency, pricing per minute, LLM flexibility, and telephony integration depth.
  • Voice AI compliance requirements vary by use case: Automated phone calls must comply with TCPA and other regulations — organizations must handle consent, disclosure, and opt-out compliance independently of Vapi's infrastructure.

Pricing

Free tier available. Pay-as-you-go from $0.05/minute. Volume discounts available. Enterprise pricing negotiated.