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Voice Agents
Platforms and frameworks for real-time voice AI agents.
JSON: /api/v1/directory.json (filter on category=voice-agents)
Vapi
Voice AI agent platform for phone calls.
PaidAPI keyRetell AI
Voice agent API for phone call automation.
PaidAPI keyBland AI
Programmable AI phone-call agents.
PaidAPI keySynthflow
No-code voice AI agents.
PaidAPI keyLiveKit
Open-source real-time audio and video infrastructure with an agents framework.
Free tierAPI keyPipecat
Open-source framework for real-time voice and multimodal agents.
FreeNo authJambonz
Open-source CPaaS for voice, popular for voice AI.
FreeNo authUltravox
Speech-native voice model and agent platform.
PaidAPI keyHume EVI
Empathic voice interface API.
Free tierAPI keyOpenAI Realtime API
Low-latency speech-to-speech API.
PaidAPI key