Lokutor

Lokutor builds its own speech models and serves them as a voice API: voice agents that hold a conversation over the web or the phone, text-to-speech, speech-to-text and noise cancellation. You pay per use from a prepaid balance in US dollars, with no plan and no monthly fee. A voice agent costs about 5¢ a minute, language model included. The exact prices are in Pricing and billing, and the live rate card is public JSON at GET /v1/pricing.

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What you can build

1. Voice Agent: full-duplex conversations over a single WebSocket, on the web or on a phone number. Speech recognition, the language model, the voice and turn-taking run together, with barge-in support.
2. Streaming TTS: send text over a WebSocket and receive audio as it is generated, with the first audio in a few hundred milliseconds. A one-shot POST /tts/synthesize returns a WAV file.
3. Speech-to-Text: transcribe a recorded clip or a live microphone stream.
4. Noise removal: clean a recording with POST /denoise. Voice agents clean the caller’s audio on every call.

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What runs a call

The models are small and efficient, and the hosted API serves them on GPUs. When call audio has to stay on your own infrastructure, the full models also run on-premise. Ito (text-to-speech) and Oído (speech recognition) are the open models for ESP32-class microcontrollers, the on-device tier. See Voices, Languages & Models for the voice list and the languages each part covers.

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Audio format

The SDK handles resampling, buffering, and scheduling.

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Building with an AI assistant?

These resources let a coding assistant work from the current documentation instead of from memory:

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Quick links