Hume AI
Expressive voice APIs: real-time speech-to-speech (EVI) and instructable text-to-speech (Octave)
Hume AI offers two voice APIs. EVI (Empathic Voice Interface) is a real-time speech-to-speech model that reads vocal expression and adjusts its replies. Octave is a text-to-speech model steered with natural-language direction, with voice cloning and voice design. SDKs cover Python, TypeScript, React, Swift and .NET.
In January 2026 Google DeepMind hired founder Alan Cowen and several engineers under a licensing deal. Hume kept operating; its homepage now leads with voice AI evaluation (Kairos, Human Feedback API). The free tier includes 10,000 TTS characters a month as of September 2026.
Pricing: Free / monthly subscriptions
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Choosing a voice agent platform right now?
One click, anonymous. Helps us know our visitors.
Thanks, that helps.
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