---
license: other
license_name: stabilityai-non-commercial
license_link: https://huggingface.co/stabilityai/sd-turbo
pipeline_tag: text-to-image
base_model: stabilityai/sd-turbo
tags:
  - android
  - webgpu
  - on-device
  - text-to-image
  - image-to-image
  - onnxruntime-web
  - sd-turbo
---

# Bonsai Image

On-device AI image generation for Android. A single APK that runs a diffusion
model **entirely on your phone's GPU** via WebGPU — no accounts, no servers, no cloud.

This repo hosts the **all-inclusive APK** (~2.5 GB, model bundled inside) because
it's over GitHub's 2 GB release-asset limit.

## Download

**[⬇️ Bonsai-Image.apk](https://huggingface.co/alphastack1/bonsai-image/resolve/main/Bonsai-Image.apk)** (~2.5 GB)

1. Enable **Install from unknown sources** on your Android device.
2. Download and open the APK.
3. Type a prompt (or attach a photo for image-to-image) and tap **Generate**.

## Requirements

- **Android 12+** with a recent **Android System WebView / Chrome (121+)**
- A **Qualcomm Adreno** or **ARM Mali** GPU (most modern phones)
- ~3 GB free storage
- WebGPU support in the system WebView — the app reports this in **Settings → Device**

## How it works

| Layer | Detail |
|---|---|
| UI | Single-file WebView app, dark theme, on-device history (localStorage) |
| Engine | [SD-Turbo](https://huggingface.co/stabilityai/sd-turbo) via `onnxruntime-web` on the **WebGPU** execution provider |
| Model | fp16 ONNX (text encoder + UNet + VAE), **bundled in the APK** |
| Tokenizer | CLIP, via `@xenova/transformers` |

Generation runs locally. First launch fetches a small (~25 MB) GPU runtime once,
then it's fully on-device.

## Status — experimental

This is an early build. The current engine is **SD-Turbo**, used as a working
stand-in. PrismML's **Bonsai 1-bit/ternary image model** (a 1-bit quantization of
FLUX.2 Klein) has no Android/WebGPU runtime yet; when one ships, it drops into the
same engine slot and the app around it stays identical.

Installs **alongside** the separate [Bonsai LLM](https://github.com/alphastack1/storage/releases)
text app — different package, violet icon.

## License

The bundled SD-Turbo weights are governed by the **Stability AI Non-Commercial
Research Community License** (see [SD-Turbo](https://huggingface.co/stabilityai/sd-turbo)).
**Non-commercial use only.**