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Vapi

Free tier

Voice agents for builders

Free tier available·All audiences·Powered by OpenAI (intelligence), Deepgram (transcriber), ElevenLabs (voice)·API available
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Key strengths

Sub-500ms average latencyEnterprise-grade scalability (billions of calls)SOC 2, HIPAA, and PCI complianceAPI-native designFully managed infrastructureReal-time monitoring and observabilityBroad telephony integrations (Twilio, Vonage, Telnyx, SIP)
Free tier + paid plans
Founded 2023
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Vapi — Technical Use Cases

Vapi is purpose-built for developers and engineering teams deploying production voice AI. Common technical implementations include:

Inbound Call Automation Route inbound calls via Twilio, Vonage, or Telnyx to Vapi-managed agents. Use SIP trunking to integrate with existing PBX infrastructure. Agents handle transcription (Deepgram), reasoning (OpenAI), and synthesis (ElevenLabs) in a single managed pipeline with sub-500ms latency.

Outbound Voice Campaigns Trigger outbound calls programmatically via the REST API. Configure agent behavior, scripts, and escalation logic per campaign. Monitor outcomes in real time through Vapi's observability layer.

Browser & App Voice Interfaces Embed voice agents directly into web or mobile applications using WebSockets or WebRTC transport — no telephony provider required for these flows.

Enterprise Multi-Tenant Deployments Use RBAC, SSO, and multi-organization support to manage voice agent deployments across business units or customers. Additional organizations available at $20/org/mo.

Regulated Industry Deployments For healthcare or financial services, enable HIPAA and PCI-compliant configurations. HIPAA add-on available at $2,000/mo.

High-Concurrency Workloads Scale concurrency with additional lines at $10/line/mo. The platform is designed for billions of calls, with fully managed infrastructure removing operational overhead.