Vapi - Build Advanced Voice AI Agents
Vapi is the leading developer platform for voice AI agents — 300M+ calls, 500K+ developers. Fully API-native with support for 100+ languages, bring-your-own LLM/TTS/transcription, A/B testing, automated hallucination test suites, sub-500ms latency, and SOC2/HIPAA/PCI compliance.
If you're building any voice interface (support bots, outbound dialers, intake flows), Vapi is the infrastructure layer that saves months of custom telephony work. The automated test suite feature is underrated.
Key points
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300M+ calls handled, 2.5M+ assistants launched, 500K+ developers — de-facto standard for voice agents
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Bring your own stack: custom LLM, TTS, or transcription APIs, or self-hosted models
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Sub-500ms latency, 99.99% uptime — purpose-built real-time audio infrastructure
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Automated testing: simulate voice agents to catch hallucinations before going to production
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SOC2, HIPAA, PCI compliant — covers healthcare and financial services deployments