Licenses and credits
MiniSpeech brings together open-source models and libraries. Here is each of them, its license and where to find its source code. The site’s own code is MIT-licensed.
Models
| Model | License | Source | Status |
|---|---|---|---|
| Kokoro 82MKokoro-82M by hexgrad (Apache-2.0); ONNX export by onnx-community. | Apache-2.0 | huggingface.co · onnx-community/Kokoro-82M-v1.0-ONNX | available |
| Kitten TTS nanoKitten TTS by KittenML (Apache-2.0). The browser runtime embeds eSpeak NG data (GPL-3.0). | Apache-2.0 | github.com · KittenML/kitten-tts-nano-0.8-int8 | soon |
| Supertonic 3Supertonic 3 by Supertone Inc. (OpenRAIL-M weights, MIT SDK). Use restrictions of the OpenRAIL-M license apply. | OpenRAIL-M | github.com · Supertone/supertonic-3 | soon |
| Whisper tinyWhisper by OpenAI (MIT); ONNX export by onnx-community. | MIT | github.com · onnx-community/whisper-tiny | soon |
| Whisper baseWhisper by OpenAI (MIT); ONNX export by onnx-community. | MIT | github.com · onnx-community/whisper-base | soon |
| Whisper smallWhisper by OpenAI (MIT); ONNX export by onnx-community. | MIT | github.com · onnx-community/whisper-small | soon |
| Moonshine tinyMoonshine by Useful Sensors (MIT); ONNX export by onnx-community. | MIT | github.com · onnx-community/moonshine-tiny-ONNX | soon |
| Moonshine baseMoonshine by Useful Sensors (MIT); ONNX export by onnx-community. | MIT | github.com · onnx-community/moonshine-base-ONNX | soon |
Software
| Component | Version | License | Used for | Source |
|---|---|---|---|---|
| eSpeak NG | phonemizer.js 1.2.1 | GPL-3.0-or-later | phonemization (English) | espeak-ng/espeak-ng |
| phonemizer.js | 1.2.1 | Apache-2.0 | phonemization (English) | xenova/phonemizer.js |
| kokoro.js | main, 2026-11-07 | Apache-2.0 | text splitting and normalization | hexgrad/kokoro/tree/main/kokoro.js |
| Transformers.js | 4.3.2 | Apache-2.0 | running the models | huggingface/transformers.js |
| ONNX Runtime Web | 1.31.0-dev.20260914-8d85527a0 | MIT | running the models | microsoft/onnxruntime |
| Astro | 7.4.7 | MIT | the site | withastro/astro |
| Bricolage Grotesque | 5.3.0 | OFL-1.1 | fonts | ateliertriay/bricolage |
| Hanken Grotesk | 5.3.0 | OFL-1.1 | fonts | marcologous/hanken-grotesk |
| MiniSpeech | MIT | the site |
eSpeak NG is GPL-3.0. It runs as a separate program (a Web Worker) that receives text and returns phonemes; that file is served as is, unminified: /workers/phonemizer-espeak.js. The GPL does not cover the audio you create: your files are yours.