Jan

Jan is a desktop app that runs open large language models entirely on your own machine, with no internet required. It works as a private, offline alternative to ChatGPT for everyday questions, writing, and chat. Models download locally, so your conversations never leave your computer.

Jan is a free desktop app that lets you download and run open large language models directly on your own computer, so your chats never leave your machine. Built on the llama.cpp engine and wrapped in a clean Tauri-based interface, it pulls models like Llama, Gemma, and Qwen from Hugging Face and runs them fully offline once downloaded. It works much like ChatGPT: you pick a model, start a conversation, and can create custom assistants for specific tasks. Jan can also connect to cloud providers such as OpenAI, Anthropic, and Mistral if you want them, and it exposes an OpenAI-compatible local API server so other apps can talk to your models. It suits privacy-conscious individuals, tinkerers, and developers who want a local AI playground without the command line.