Vapi
Developer platform for building, testing and deploying voice agents that answer and place phone calls
Vapi is a developer platform for building, testing and deploying voice AI agents. Agents built on it handle phone and voice conversations for a business, such as answering support calls, qualifying inbound leads and scheduling appointments, while Vapi runs the infrastructure.
Key features:
- Configuration of voice, conversation flow, telephony and integrations.
- Full catalog of transcription, language and voice models.
- Real-time call monitoring to find what works and improve agents.
- API-native design with Vapi telephony, SIP, WebSockets and WebRTC.
- AI guardrails against hallucinations.
- Infrastructure that scales to millions of calls with sub-500ms latency.
Vapi is SOC 2, HIPAA and PCI compliant and offers SSO, OAuth and RBAC for enterprises. It starts with $5 in free credits and per-minute usage billing that passes through model and voice provider costs. The Core package is $29/month with more phone numbers and concurrent calls, Pro has a $999/month minimum with uptime SLAs, and HIPAA compliance is a $2,000 add-on.