Vapi is a voice AI infrastructure platform designed for developers and businesses that want to create conversational voice agents. It provides APIs and tooling to build AI phone agents capable of conducting natural-sounding conversations, handling inbound customer calls, and running outbound calling campaigns. Vapi abstracts the complexity of telephony, speech-to-text, large language model orchestration, and text-to-speech into a unified developer interface. Users can configure voice agents with custom prompts, choose from multiple LLM and voice providers, define call flows, and connect agents to external tools or APIs via function calling. The platform supports real-time transcription, call recording, and analytics. Vapi is positioned as infrastructure rather than a no-code builder, targeting engineering teams that want programmatic control over voice AI deployments. It is used across industries including customer support, healthcare scheduling, sales, and logistics.
Target audience and deployment
- Startup
- SMB
- Mid-market
- Enterprise
- Cloud
- API
Key features
Use cases
- Automate inbound customer support calls
- Run outbound calling campaigns
- Build custom voice AI applications
- Schedule appointments via phone
- Conduct AI-driven phone surveys
Best for
- Developers who need to build and deploy production-ready AI voice agents via API
- Startups who need to automate phone-based customer interactions without large support teams
- Enterprise teams who need scalable outbound calling infrastructure powered by AI
- Product teams who need to embed voice AI capabilities into existing applications
Integrations
Developer
Twilio
AI models included
OpenAI, Anthropic, Google Gemini, Deepgram, ElevenLabs, Groq