Supertonic

Fast, lightweight, open-source text-to-speech

Open-source, on-device text-to-speech engine designed for local, faster-than-real-time speech generation using ONNX models and cross-language runtimes.

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releasePRIMARY2026-05-17

Supertone opens Supertonic with ONNX on-device TTS

Supertone open-sourced Supertonic, a local TTS engine that runs faster than real time on phone CPUs with ONNX models and cross-language runtimes. Voice apps and audiobook workflows can use it to avoid per-character API billing and keep audio generation private.