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Magentic-UI vs Nanobrowser: catalog facts
Magentic-UI	Nanobrowser
Free Free and open source; model usage may cost money depending on the provider you configure.	Free Free and open source; you pay your chosen LLM provider for API usage.
Self-hosted	Browser extension
Agent works across both the browser and local files Designed to run with smaller models	Runs inside your own browser Bring your own LLM API key
Experimental research project Requires setting up Python and a model configuration	Needs a paid API key from a model provider Chrome-focused
Self-hosted	Browser extension
Open source	Open source
License: MIT	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 October 1, 2026	Official website Full listing and sources Checked September 26, 2026

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