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Nook vs Arc: catalog facts
Nook	Arc
Free Free and open source, supported through Open Collective.	Free Free to download and use. The software is closed source.
macOS	Windows, macOS
Sidebar and spaces for organising tabs Runs both Chrome and Safari extensions	Spaces keep work, personal and project browsing genuinely separate Split view and the command bar make keyboard-driven browsing fast
macOS only Young project, recently reached version 1.0	The Browser Company has shifted its development focus to a newer browser, so Arc receives limited feature work No Linux build, and an account is required to use it
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 22, 2026

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