AI KeyboardThe components below are open-source software or openly licensed models, and their licence texts are published here as the licences require. The same notices ship inside the app. Corrections are welcome at support@kengblog.com.
Offline speech and on-device AI
| Component | Licence | Used for | Source |
|---|---|---|---|
| sherpa-onnx Android runtime | Apache-2.0 Licence text | Runs the offline SenseVoice speech recogniser. Built from source for arm64-v8a, recognition only. | github.com/k2-fsa/sherpa-onnx |
| ONNX Runtime | MIT Licence text | Runs the SenseVoice model inside sherpa-onnx. | github.com/microsoft/onnxruntime |
| kaldi-native-fbank | Apache-2.0 Licence text | Audio feature extraction, statically linked in sherpa-onnx. | github.com/csukuangfj/kaldi-native-fbank |
| kaldi-decoder | Apache-2.0 Licence text | Decoding, statically linked in sherpa-onnx. | github.com/k2-fsa/kaldi-decoder |
| kaldifst (with OpenFST-derived code) | Apache-2.0 Licence text | Statically linked in sherpa-onnx. | github.com/k2-fsa/kaldifst |
| simple-sentencepiece | Apache-2.0 Licence text | Tokenisation, statically linked in sherpa-onnx. | github.com/pkufool/simple-sentencepiece |
| LLVM libc++ (Android NDK 27.2.12479018) | Apache-2.0 with LLVM Exceptions, and MIT Licence text | C++ runtime. | libcxx.llvm.org/ |
| llama.cpp and ggml | MIT Licence text | Runs the optional on-device writing-style model on the CPU. | github.com/ggml-org/llama.cpp |
| OpenCC4j | Apache-2.0 Licence text | Traditional-Chinese phrase conversion for Taiwan. | github.com/houbb/opencc4j |
ONNX Runtime's complete upstream third-party notices, including its bundled dependencies, are in ONNX_RUNTIME_THIRD_PARTY_NOTICES.txt. The pinned upstream releases provide licence files but no separate NOTICE files.
Models, downloaded on demand
These are not bundled in the app. They are downloaded from Hugging Face to private app storage when you ask for them, and verified by checksum.
| Model | Licence | Notes |
|---|---|---|
| SenseVoice Small, INT8 ONNX | FunASR Model Open Source License Agreement v1.1 (custom, not MIT). Licence text | Requires attribution to the source and author and retention of the model names. The licence describes the model software as for reference and learning purposes only. Original: github.com/FunAudioLLM/SenseVoice. Converted artefact: Hugging Face. |
| Qwen3 0.6B and Qwen3 1.7B (Q4_K_M GGUF) | Apache-2.0. Licence text | GGUF quantisations by bartowski: 0.6B, 1.7B. Original: github.com/QwenLM/Qwen3. |
Japanese and Chinese typing engines
Bundled in the app and run entirely on the device, with no network calls. Full licence texts: CJK_TYPING_LICENSES.txt.
| Component | Licence | Used for | Source |
|---|---|---|---|
| Mozc | BSD 3-Clause | Japanese conversion. Its dictionary derives from IPAdic (Nara Institute of Science and Technology, ICOT Free Software terms) and the public-domain Okinawa dictionary. Statically links Abseil (Apache-2.0) and Protocol Buffers lite (BSD 3-Clause). | github.com/google/mozc |
| librime | BSD 3-Clause | Chinese input engine. | github.com/rime/librime |
| yaml-cpp, LevelDB, marisa-trie | MIT; BSD 3-Clause; BSD 2-Clause | Libraries used by librime. marisa-trie is used under its BSD 2-Clause option (it is offered as BSD 2-Clause or LGPL-2.1-or-later). | github.com/jbeder/yaml-cpp |
| OpenCC | Apache-2.0 Licence text | Script conversion between Traditional and Simplified Chinese, including the t2tw chain for Traditional (Taiwan). | github.com/BYVoid/OpenCC |
| Rime Luna Pinyin (朙月拼音) and Rime Essay | GNU LGPL v3.0 | Pinyin data. The app's compiled pinyin table is a build product of these two datasets, and its schemas are reduced derivatives of Luna Pinyin's. | github.com/rime/rime-luna-pinyin |
Android and Kotlin libraries
The app also uses Jetpack Compose and other AndroidX libraries, Dagger Hilt, Room, Kotlin coroutines and serialization, Retrofit and OkHttp, all under the Apache License 2.0, which is reproduced in LICENSE-APACHE-2.0.txt.
All notice files
- third_party_notices.txt, the notice file shipped in the app
- LICENSE-APACHE-2.0.txt
- CJK_TYPING_LICENSES.txt
- FUNASR_MODEL_LICENSE.txt
- LLAMA_CPP_LICENSE.txt, ONNX_RUNTIME_LICENSE.txt, ONNX_RUNTIME_THIRD_PARTY_NOTICES.txt
- KALDI_NATIVE_FBANK_LICENSE.txt, KALDI_DECODER_LICENSE.txt, KALDIFST_LICENSE.txt, SIMPLE_SENTENCEPIECE_LICENSE.txt
- LLVM_LIBCXX_LICENSE.txt, OPENCC4J_LICENSE.txt