Vapi

// about Vapi

Vapi is a developer platform for building voice AI agents that can make and receive phone calls. It handles the complex infrastructure of telephony, speech-to-text, LLM integration, and text-to-speech — letting developers focus on the conversation logic. Vapi supports custom voices via ElevenLabs and Cartesia, pluggable LLMs including GPT-4 and Claude, and function calling for taking actions during calls. Companies use it for AI receptionists, appointment booking, outbound sales calls, and customer support automation.