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Fellou vs Nanobrowser: catalog facts
Fellou	Nanobrowser
Freemium Free to download, with paid plans for heavier agent use.	Free Free and open source; you pay your chosen LLM provider for API usage.
Windows, macOS	Browser extension
Agent can run multi-step tasks across several websites Shows an editable action plan before it acts	Runs inside your own browser Bring your own LLM API key
Browser itself is closed source Agent actions depend on AI services and an internet connection	Needs a paid API key from a model provider Chrome-focused
Downloadable app	Browser extension
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 26, 2026

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