Overview
Vapi is a developer-focused voice AI infrastructure platform founded in 2023 by Jordan Dearsley and Nikhil Gupta, who previously went through Y Combinator (W21) with a productivity startup. Vapi was born when they pivoted away from an AI therapist product after discovering that startups wanted the underlying low-latency voice infrastructure more than the application itself.
The platform handles the full orchestration layer of a voice AI call stack: real-time speech-to-text, LLM inference, text-to-speech, telephony, and call routing. Developers connect their preferred providers — Deepgram for transcription, ElevenLabs for voice synthesis, OpenAI or Anthropic for reasoning — and Vapi glues them together with sub-second latency targets and human-like conversational features such as interruption detection, backchanneling, and noise filtering.
By mid-2026, Vapi has processed over one billion calls, raised $75 million in funding from Kleiner Perkins, Bessemer Venture Partners, and Microsoft M12, and reached a $500 million valuation after winning deployments like Amazon Ring. It is firmly positioned as the infrastructure choice for engineering teams — not a no-code tool. Non-technical buyers should look elsewhere; Vapi's value is in low-level configurability and multi-model flexibility, not ease of use.
Key Benefits
- Model flexibility: Swap LLMs, STT, and TTS providers independently, avoiding vendor lock-in.
- Production scale: 1 billion+ calls processed gives confidence in infrastructure reliability at volume.
- Advanced conversation features: Interruption handling and backchanneling produce noticeably more natural voice interactions than simpler platforms.
- Multi-agent routing: The Squad feature lets calls be handed between specialized agents mid-conversation.
Use Cases
- Inbound customer support automation — Deploy 24/7 voice agents that handle FAQs, order status, and appointment booking with CRM integration via webhooks.
- Outbound sales and appointment dialing — Run high-volume outbound campaigns with dynamic scripting and real-time lead qualification.
- Voice interface for SaaS products — Embed conversational voice capabilities directly into web or mobile apps via WebSocket API.
- Healthcare and telehealth intake — Automate patient intake calls, triage questions, and appointment reminders with HIPAA-compliant configurations.