Vapi

Vapi is infrastructure for building voice agents. It handles the hard parts of a phone conversation — telephony, streaming speech recognition, turn detection, interruption handling, and speech synthesis — so you write the agent logic rather than a real-time audio pipeline.

What it handles

• Telephony. Buy numbers, place outbound calls, receive inbound ones, transfer to humans, and navigate IVR trees.
• Orchestration. Speech in, model, speech out, with the latency budget managed so conversations feel natural.
• Interruption handling. Callers talk over agents constantly; Vapi detects it and yields, which is what separates a usable agent from an infuriating one.
• Model choice. Bring your preferred language, speech recognition, and voice models rather than accepting a fixed stack.
• Tools and functions. Agents can look up an order, book an appointment, or write to your CRM mid-call.
• Observability. Recordings, transcripts, and per-call analytics for evaluating and improving agents.

Who builds on it

Teams shipping appointment scheduling, lead qualification, support triage, and outbound follow-up. Free credits for prototyping, then per-minute pricing, with enterprise options for compliance requirements.