# Supertonic — Lightning-Fast On-Device Multilingual TTS via ONNX

> A high-performance text-to-speech engine that runs natively on-device across 12+ languages with bindings for Rust, Python, Swift, Go, and more.

## Install

Save in your project root:

# Supertonic — Lightning-Fast On-Device Multilingual TTS via ONNX

## Quick Use
```bash
pip install supertonic
python -c "import supertonic; supertonic.tts('Hello world', lang='en', out='hello.wav')"
```

## Introduction
Supertonic is an on-device text-to-speech engine built for speed and portability. It uses ONNX Runtime for inference, enabling natural-sounding speech synthesis across multiple languages without requiring a network connection or GPU.

## What Supertonic Does
- Generates natural speech from text in 12+ languages on-device
- Runs via ONNX Runtime with no cloud dependency required
- Provides native bindings for Rust, Python, Swift, Java, Go, C#, and more
- Supports WebGPU for browser-based inference
- Delivers low-latency synthesis suitable for real-time applications

## Architecture Overview
Supertonic packages pre-trained TTS models in ONNX format and runs them through ONNX Runtime on the target platform. A lightweight text processing pipeline handles phonemization and prosody, then feeds tokens to the neural vocoder. Platform-specific bindings wrap the core Rust engine via FFI, keeping the API consistent across languages.

## Self-Hosting & Configuration
- Install via pip, npm, cargo, or platform-specific package managers
- Models are bundled or downloaded on first use (typically 50-200 MB per language)
- Configure voice, speed, and pitch through API parameters
- No API keys or cloud accounts needed
- Runs on CPU by default; GPU acceleration available via ONNX Runtime providers

## Key Features
- Sub-second latency for short utterances on modern hardware
- Supports Rust, Python, C#, Java, Go, Swift, Ruby, PHP, Elixir, and WebAssembly
- Multilingual support covering major world languages
- Small model footprint suitable for mobile and embedded deployment
- Apache 2.0 licensed with no usage restrictions

## Comparison with Similar Tools
- **Kokoro** — lightweight 82M-parameter TTS; Supertonic focuses on broader language coverage and cross-platform bindings
- **Bark** — generates speech with music and effects; Supertonic prioritizes speed and on-device deployment
- **F5-TTS** — flow-matching approach; Supertonic uses ONNX for maximum portability
- **Fish Speech** — multilingual but Python-focused; Supertonic offers native bindings in 10+ languages
- **Piper** — fast local TTS; Supertonic provides more language bindings and WebGPU support

## FAQ
**Q: Does Supertonic require a GPU?**
A: No. It runs on CPU by default, with optional GPU acceleration through ONNX Runtime execution providers.

**Q: What languages are supported for speech synthesis?**
A: English, Korean, Japanese, Chinese, Spanish, French, German, Italian, Portuguese, Hindi, Thai, and Vietnamese among others.

**Q: Can I use it in a mobile app?**
A: Yes. Native bindings for Swift (iOS) and Java (Android) are provided, along with compact model sizes suitable for mobile.

**Q: Is it free for commercial use?**
A: Yes. Supertonic is released under the Apache 2.0 license.

## Sources
- https://github.com/supertone-inc/supertonic
- https://supertonic.ai

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Source: https://tokrepo.com/en/workflows/supertonic-lightning-fast-device-multilingual-tts-via-onnx-d382dcfb
Author: AI Open Source