LMPlayground

<h1 align="center">LM Playground</h1> <p align="center"> <img src="art/logo.png"/> </p>

LM Playground is an Android application for running Large Language Models locally on-device. Download models, load them in one tap, and chat - all offline, all private. Powered by llama.cpp with GGUF-format models from Hugging Face.

Features

• On-device inference - no cloud, no API keys, fully offline
• Rich markdown in chat responses - headers, code blocks, lists, and more
• Reasoning model support - thinking steps from models like DeepSeek R1 and Nemotron are displayed in a styled section
• Reliable background downloads - custom download engine with OkHttp and WorkManager, progress notifications with speed and ETA, automatic resume on network interruptions
• Storage management - choose where to keep multi-GB model files with Android's Storage Access Framework
• ARM optimized - KleidiAI kernels and OpenMP for faster generation on arm64 devices

Supported Models

| Family | Sizes | Provider | |--------|-------|----------| | Qwen 3.5 | 0.8B, 2B, 4B | Alibaba | | Qwen 3 | 0.6B, 1.7B, 4B | Alibaba | | Gemma 3n | E2B, E4B | Google | | Gemma 3 | 1B, 4B | Google | | Nemotron 3 Nano | 4B | NVIDIA | | Granite 4.0 | Micro, H-Tiny | IBM | | DeepSeek R1 Distill | 1.5B, 7B | DeepSeek | | Phi-4 mini | 3.8B | Microsoft | | LFM2.5 Thinking | 1.2B | Liquid AI | | Ministral 3 | 3B, 8B (Instruct & Reasoning) | Mistral | | Llama 3.2 | 1B, 3B | Meta | | Llama 3.1 | 8B | Meta |

<details> <summary>Legacy models</summary>

| Family | Sizes | Provider | |--------|-------|----------| | Qwen 2.5 | 0.5B, 1.5B | Alibaba | | Phi 3.5 mini | 3.8B | Microsoft | | Mistral v0.3 | 7B | Mistral | | Gemma 2 | 9B | Google |

</details>

Most models use Q4_K_M quantization; Qwen 3.5 uses Q3_K_M. See ModelInfoProvider.kt for the full list.

Install

If you're just looking to install LM Playground, you can find it on Google Play. If you're a developer wanting to contribute, read on.

Build Instructions

Prerequisites:

• Android Studio 2024.3.1+
• NDK 27.2.12479018
• CMake 3.31.6

1. Clone the repository with submodules:

git clone --recurse-submodules https://github.com/andriydruk/LMPlayground.git

2. Open the project in Android Studio: File > Open > Select the cloned repository.
3. Connect an Android device or start an emulator.
4. Run the application using Run > Run 'app' or the play button in Android Studio.

License

This project is licensed under the MIT License.

Acknowledgments

This project is built on llama.cpp. Models are GGUF-format with Q4_K_M quantization sourced from Hugging Face.

Contact

If you have any questions, suggestions, or issues, feel free to open an issue or contact me directly at me@andriydruk.com.