Open Source Project of the Day (Part 11): Supertonic - Lightning-Fast On-Device Multilingual TTS

Introduction "What if speech synthesis could run on your device at 1000+ characters per second — completely offline, supporting 50+ languages?" This is Part 11 of the "Open Source Project of the Day" series. Today we explore Supertonic ( GitHub ). Traditional TTS systems either rely on cloud APIs (with latency and privacy concerns) or are slow with poor quality. Supertonic uses ONNX Runtime to deliver blazing-fast, high-quality, fully on-device speech synthesis — reaching 1000+ characters/second on an M1 Mac, supporting 50+ languages, with built-in intelligent text normalization requiring no preprocessing. Speech synthesis truly "flies." What You'll Learn Supertonic's core architecture and technical characteristics How to use Supertonic for TTS across various platforms The advantages and implementation of ONNX Runtime How built-in text normalization works Streaming processing and real-time speech synthesis Comparative analysis with other TTS systems How to start building applications w