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Zen Browser vs Nook: catalog facts
Zen Browser	Nook
Free Free and open source, funded by donations.	Free Free and open source, supported through Open Collective.
Windows, macOS, Linux	macOS
Vertical tabs, workspaces and split view built in, no extensions needed Firefox engine, so Firefox extensions and containers work	Sidebar and spaces for organising tabs Runs both Chrome and Safari extensions
Young project; interface changes between releases and bugs surface A small team maintaining a Firefox fork is a real long-term risk	macOS only Young project, recently reached version 1.0
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License not stated
No account needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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