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Jan vs WebLLM Chat: catalog facts
Jan	WebLLM Chat
Free Free and open source. Using a third-party cloud model through Jan costs whatever that…	Free Free to use in the browser.
Windows, macOS, Linux	Web
Runs fully offline on your own computer when you want it to Same interface for local models and for OpenAI, Anthropic, Google, Mistral and others	Runs models locally in the browser with no install Conversations are processed without a server
Still pre-1.0 and moving fast; features appear and change between releases Adding a cloud provider means putting that provider’s API key into the app	Requires a browser and GPU with WebGPU support Models must be downloaded before first use
Downloadable app	Web application
Open source	Closed source
License: Apache-2.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.