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piper-plus / uPiper

piper-plus, a lightweight Japanese-capable TTS, and uPiper, a library for using it from Unity.

Date

March 2025

Role

Design, implementation, training, release

Tech

TTS, ONNX, Unity, C#, Japanese G2P

Overview

A speech synthesis model based on the lightweight TTS “Piper”, extended to support Japanese, plus a library for running it on-device from Unity.

What I did

Model training, Japanese grapheme-to-phoneme (G2P) conversion, and the design and release of the Unity library.

Links

piper-plus (GitHub)ayutaz/piper-plusMultilingual neural TTS (6 languages: JA/EN/ZH/ES/FR/PT, code supports SV) — C++, C#, Rust, Go, Python, npm (WASM). VITS + Prosody, streaming, CUDA/CoreML/DirectML. pip install piper-plus | npm ins...github.comuPiper (GitHub)ayutaz/uPiperUnity TTS plugin: Piper neural synthesis + pure C# G2P (6 languages: ja/en/zh/es/fr/pt) + Unity Inference Engine. Windows/Mac/Linux/Android/iOS/WebGL ready. High-quality voices for games & apps...github.com