Jan

An open-source, offline ChatGPT alternative that runs entirely on your machine.

Jan is a desktop AI app that runs LLMs fully offline on your own computer, positioned as an open-source alternative to ChatGPT. It bundles its own local inference engine (Cortex, built on llama.cpp), lets you download and switch between open-weight models, and can also connect to remote OpenAI-compatible providers. It exposes a local OpenAI-compatible API server so other apps can call your local models.