Stable mirrors of on-device AI models used by the ChatBack Android app.
All inference runs 100% locally on the user's device — no data is sent to any server.
Powers all chatroom AI features: smart replies, tone warnings, draft assistant,
auto-translation, summarisation, and AI Chat (when no large model is activated).
True 4 096-token KV cache baked into the .task file. Fast, low-RAM (~2 GB+), GPU/NPU-accelerated via LiteRT.
AI Chat Upgrade (Optional — requires base model)
Model
File
Size
License
Gemma 4 E2B-IT (LiteRT)
gemma4-e2b/gemma-4-E2B-it.litertlm
~2.5 GB
Gemma Terms of Use
Gemma 4 E2B-IT Abliterated (NSFW, LiteRT)
gemma4-e2b/Gemma-4-E2B-it-abliterated.litertlm
~2.5 GB
Gemma Terms of Use
Best AI Chat quality. Loaded only while AI Chat is open; base model restores
automatically when you leave AI Chat. Requires 3 GB+ RAM.
The abliterated variant has safety alignment removed and is only visible when
NSFW mode is enabled in the app.
Text-to-Speech
Model
Size
License
Piper TTS — Amy, Lessac, LibriTTS-R, Ryan, Joe (ONNX medium)
~178 MB total
MIT
Kokoro TTS English v1.0 (q8f16 ONNX, 28 voices)
~100 MB
Apache 2.0
Kokoro uses mixed int8-weight/float16-activation quantization for better audio quality
vs pure int8. The app uses its own Java IPA phonemizer — no espeak-ng dependency.
Download URLs used by the app
# Base model
https://huggingface.co/Chazzo2008/chatback-ai-models/resolve/main/gemma3-1b/Gemma3-1B-IT_multi-prefill-seq_q4_block128_ekv4096.task
# Large model upgrade
https://huggingface.co/Chazzo2008/chatback-ai-models/resolve/main/gemma4-e2b/gemma-4-E2B-it.litertlm
# Large model — NSFW abliterated variant
https://huggingface.co/Chazzo2008/chatback-ai-models/resolve/main/gemma4-e2b/Gemma-4-E2B-it-abliterated.litertlm
