Vapi

Vapi is a developer platform for building voice AI agents — AI that can hold natural, real-time phone conversations to handle calls, answer questions, book appointments, qualify leads and more. It gives developers the infrastructure to create production-grade voice assistants with low latency and lifelike conversation, abstracting away the enormous complexity of stitching together speech-to-text, language models and text-to-speech into a smooth, responsive voice experience.

The platform's strength is flexibility and performance. Vapi lets developers configure their voice agents with their choice of speech recognition, language models and voices, and handles the hard real-time orchestration — turn-taking, interruptions, latency optimization — that makes a voice conversation feel natural rather than stilted. Through clean APIs and SDKs, teams can build assistants that integrate with their own systems, call external tools and functions, and connect to telephony so the agents can place and receive actual phone calls at scale.

This makes Vapi valuable across a wide range of use cases: customer support lines that resolve calls without human agents, outbound calling for sales and reminders, receptionists and booking assistants, and any scenario where voice is the right interface. Because it's developer-first and highly configurable, teams retain control over how their agents behave, sound and integrate, rather than being boxed into a rigid product. As voice AI rapidly improves and businesses look to automate phone interactions, Vapi has become a leading platform for building these experiences. For developers and companies that want to deploy capable, natural-sounding voice agents — and to do so with the flexibility to tailor every part of the stack — Vapi offers a powerful, modern foundation for the emerging world of conversational voice AI.