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Nook vs iCab: catalog facts
Nook	iCab
Free Free and open source, supported through Open Collective.	Freemium Shareware for about 10 USD/EUR, usable free with a small limitation.
macOS	macOS
Sidebar and spaces for organising tabs Runs both Chrome and Safari extensions	Built-in ad and content filtering Per-site automatic settings
macOS only Young project, recently reached version 1.0	macOS only Small limitation in the free version
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account 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 October 2, 2026

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