Supertonic is an open-source on-device text-to-speech (TTS) system offering fast performance, full offline capability, intelligent text normalization, multilingual support, and free usage. It utilizes ONNX Runtime for efficient inference across multiple platforms and supports streaming TTS for real-time applications. Supertonic includes built-in text normalization handling numbers, dates, times, abbreviations, units, and technical terms in five languages: English, Chinese, Korean, Spanish, and Portuguese. Performance optimization techniques include model compression, quantization, operator fusion, hardware acceleration (GPU/NPU/CPU), batch processing, caching, and preloading. It is suitable for mobile app developers needing on-device TTS, desktop app developers requiring offline speech synthesis, privacy-conscious users, internationalized apps needing multilingual support, and scenarios demanding extreme performance or real-time speech synthesis.
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