Vapi

Vapi AI. Voice AI & Telephony.

Developer voice AI platform engineered for sub-500ms latency phone calls. Powers inbound call answering, appointment booking, and emergency call routing.

Best for: Small businesses needing a 24/7 AI receptionist that sounds natural, handles interruptions, and transfers calls to live staff.

Free Credit / Pay-as-you-go (~$0.05/minute)