Jan

Jan is an open-source ChatGPT alternative designed to run 100% offline. It provides both a polished GUI and an API server at localhost:1337, powered by llama.cpp. Features an OpenAI-compatible API for drop-in replacement of cloud services, GPU control for performance tuning, direct llama.cpp settings access, and support for connecting to Gemini and DeepSeek APIs when online. The go-to choice for privacy-conscious users who want a ChatGPT-like experience without sending data to the cloud.