Jan

Jan is a fully open-source desktop application that provides a ChatGPT-style interface for local models. It supports model downloads, conversation history, and a growing extension ecosystem. Jan strikes a balance between ease of use and developer flexibility, with all data stored locally.

Best for: Users who want an open-source alternative to LM Studio with full data control

• ✓ ChatGPT-style conversation interface
• ✓ Local model library with one-click install
• ✓ Conversation history stored locally
• ✓ Extension / plugin system
• ✓ Fully open source (MIT license)
• ✓ Remote model support (OpenAI, Anthropic) alongside local