Local Dream

Run Stable Diffusion on Android Devices with Snapdragon NPU Acceleration. Also supports CPU/GPU inference.

Quick Start

1. Download: Get the APK file 2. Install: Install the APK on your Android device 3. Select Models: Open the app and download the model(s) you want to use

Features

- 🎨 txt2img – Generate images from text descriptions - 🖼️ img2img – Transform existing images - 🎭 inpaint – Redraw selected areas of images - Prompt Weights – Emphasize certain words in prompts using syntax like (masterpiece:1.5). Same format as Automatic1111: https://github.com/AUTOMATIC1111/stable-diffusion-webui - Embeddings – Support for custom embeddings like EasyNegative. SafeTensor format is required. Convert .pt files to safetensors using: https://chino.icu/local-dream/pt2sf.py - Upscalers – 4x upscaling with realesrgan_x4plus_anime_6b and 4x-UltraSharpV2_Lite

Technical Implementation

NPU Acceleration

- SDK: Qualcomm QNN SDK leveraging Hexagon NPU - Quantization: W8A16 static quantization for optimal performance - Resolution: Fixed 512×512 model shape - Performance: Extremely fast inference speed

CPU/GPU Inference

- Framework: Powered by MNN framework - Quantization: W8 dynamic quantization - Resolution: Flexible sizes (128×128, 256×256, 384×384, 512×512) - Performance: Moderate speed with high compatibility

NPU High-Resolution Support

After downloading a 512 resolution model, you can download patches to enable 768×768 and 1024×1024 image generation

⛔ Important

Please note that quantized high-resolution models may produce images with poor layout. We recommend first generating at 512 resolution (optionally upscaling it to 2048), then using the high-resolution model for img2img (essentially Highres.fix). The suggested img2img denoise_strength is around 0.8. This workflow produces images with better layout and details.

Device Compatibility

NPU Acceleration Support

Compatible with devices featuring:

- Snapdragon 8 Gen 1 - Snapdragon 8+ Gen 1 - Snapdragon 8 Gen 2 - Snapdragon 8 Gen 3 - Snapdragon 8 Elite - Snapdragon 8 Elite Gen 5 - Non-flagship chips with Hexagon V68 or higher (e.g., Snapdragon 7 Gen 1, 8s Gen 3)

⚠️ Note:

Devices outside this list cannot download NPU models.

CPU/GPU Support

- RAM Requirement: Approximately 2 GB of available memory - Compatibility: Most Android devices from recent years

⛔ Warning!

This version of the app does not include NSFW filters.