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Supertonic Overview

Supertonic is a lightning-fast, on-device multilingual text-to-speech (TTS) system from Supertone Inc., designed for local inference with minimal overhead. Powered by ONNX Runtime, it runs entirely on your device — no cloud, no API calls, no privacy concerns.

• Blazingly Fast: Low-latency, real-time synthesis across desktop, browser, mobile, and edge — fast enough to turn an entire webpage into audio in under a second.
• 31-Language Multilingual: Synthesize speech directly from text across 31 languages, or pass lang=\"na\" for language-agnostic input.
• 99M-Parameter Open-Weight Model: A compact, fully open-weight checkpoint — a fraction of the size of 0.7B to 2B class open TTS systems.
• Edge-Device Ready: Runs locally on desktop, mobile, browsers, and resource-constrained hardware like Raspberry Pi or e-readers, with zero network dependency and no GPU required.
• 44.1kHz High-Quality Audio: Outputs studio-grade 44.1kHz 16-bit WAV directly, ready for production playback.
• Expression Tags: 10 inline tags (e.g. <laugh>, <breath>, <sigh>) bring natural human nuance into generated speech.
• Multi-Runtime SDKs: Ready-to-use ONNX Runtime examples across Python, Node.js, Browser (WebGPU), Java, C++, C#, Go, Swift, iOS, Rust, and Flutter.
• Voice Builder & Supertone Play: Companion Voice Builder turns short reference audio into a permanent custom voice profile; Supertone Play and the Supertone API provide hosted workflows and zero-shot voice cloning.