Jan

Jan positions itself as the open source, privacy-first alternative to ChatGPT. Developed by Homebrew Computer Company, this desktop and mobile app runs language models entirely locally, ensuring your data never leaves your device.

Jan's interface is reminiscent of ChatGPT with a clean, modern design. It features smooth conversational chat, a model hub for downloading Llama 3, Gemma, Mistral and other popular models, plus the ability to connect to cloud APIs (OpenAI, Anthropic, Groq) when you need more powerful models.

One of Jan's standout features is its extensible architecture inspired by VSCode/Obsidian: an extension system lets you add connectors (Gmail, Google Drive, Notion), tools and custom features. Jan also includes a local API server compatible with OpenAI on port 1337.

With over 3.1 million downloads and 28,600 GitHub stars, Jan enjoys an active community. The app is licensed under AGPLv3, ensuring the code stays open. The proprietary Jan-v2 (multimodal) and Jan-v1 (with web search) models extend capabilities beyond simple text chat.

Jan is available on macOS, Windows, Linux and soon as a browser extension, offering maximum flexibility for all user profiles.