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

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