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Sigma AI Browser vs Fellou: catalog facts
Sigma AI Browser	Fellou
Free Described by the developer as a free browser.	Freemium Free to download, with paid plans for heavier agent use.
Windows, macOS, Android, iOS	Windows, macOS
Built-in AI agent that acts on web pages Local Eclipse LLM keeps prompts on the device	Agent can run multi-step tasks across several websites Shows an editable action plan before it acts
Cloud AI features send data off the device Developer and licensing details are not clearly stated	Browser itself is closed source Agent actions depend on AI services and an internet connection
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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