Vapi
Full-stack platform for building, testing, and deploying voice AI agents. Handles real-time telephony, multi-provider LLM routing, interruption detection, and call analytics. Most-adopted voice agent infrastructure in production.
LiveKit Agents
Real-time voice agent framework built on LiveKit's WebRTC infrastructure. Handles low-latency audio streaming, voice activity detection, and multi-participant sessions. Strong for production deployments where latency and scalability are critical. 9K+ GitHub stars.