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HARPA AI vs Fellou: catalog facts
HARPA AI	Fellou
Freemium Free to install, with paid plans for heavier use of hosted models.	Freemium Free to download, with paid plans for heavier agent use.
Browser extension	Windows, macOS
Works with many AI providers and local models YouTube, PDF and page summaries in place	Agent can run multi-step tasks across several websites Shows an editable action plan before it acts
Mainly a Chrome extension Hosted models send page content to third-party AI providers	Browser itself is closed source Agent actions depend on AI services and an internet connection
Browser extension	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
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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