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BrowserOS vs Nanobrowser: catalog facts
BrowserOS	Nanobrowser
Free Free and open source.	Free Free and open source; you pay your chosen LLM provider for API usage.
Windows, macOS, Linux	Browser extension
Built-in AI agents that act on web pages Can use local models instead of a cloud service	Runs inside your own browser Bring your own LLM API key
Agent features are new and still changing quickly Local models need capable hardware to run well	Needs a paid API key from a model provider Chrome-focused
Downloadable app	Browser extension
Open source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 26, 2026

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