Platforms
Voice agent platforms
One page per platform with every feature, the vendor's own wording, a source link and the date we checked it.
Bland AIBland · Managed platform, own modelsPrice per minute: $0.14/min7 yes · 2 partial · 2 unknownCartesia AgentsCartesia · Managed agents + Line SDKPrice per minute: $0.03/min8 yes · 2 partial · 1 unknownDeepgram Voice Agent APIDeepgram · Voice agent APIPrice per minute: $0.075/min6 yes · 4 partial · 1 unknownElevenLabs AgentsElevenLabs · Managed platformPrice per minute: $0.08/min + LLM9 yes · 1 partial · 1 unknownLiveKit AgentsLiveKit · Open-source framework + cloudPrice per minute: $0.01/min overage10 yes · 1 partial · 0 unknownOpenAI Realtime APIOpenAI · Speech-to-speech model APIPrice per minute: Per token3 yes · 3 partial · 4 unknownRetell AIRetell AI · Developer platformPrice per minute: $0.07–$0.31/min10 yes · 1 partial · 0 unknownSynthflowSynthflow · Enterprise no-code platformPrice per minute: Annual contract5 yes · 3 partial · 1 unknownUltravoxUltravox · Speech-native model + platformPrice per minute: $0.05/min5 yes · 2 partial · 4 unknownVaaniVaani · Developer platform (India-first)Price per minute: ₹1/min + components6 yes · 3 partial · 2 unknownVapiVapi · Developer platformPrice per minute: $0.05/min + models9 yes · 2 partial · 0 unknown
Not included yet
- Hume EVI: Hume's site now centres on its Audio Decisions API and evals; the EVI docs URL shows different content, so it's left out until its agent product is clearly documented again. Source
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