Vapi

Supports sub‑600 ms latency with natural turn‑taking for conversational flow across phone and web.

Agents can make and receive phone calls and be embedded in web applications for live voice chat.

Bring-your‑own or choose from 200+ providers for LLM, STT, TTS, with modular swapping and failover.

Compose multi‑assistant workflows, with context‑preserving transfers and branching logic via canvases.

Full REST API, CLI integration, and SDK support enable managing assistants, phone numbers, workflows, and campaigns.

Built‑in logging, dashboards, A/B testing, evals, metrics tracking, and reporting exports.

Canvas UI enables building logic with nodes that call APIs, branch, escalate, or reroute mid‑call.

Supports SOC 2, HIPAA, PCI compliance, SSO, RBAC, custom data retention, and on‑prem or multi‑tenant deployment.