Compare software

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

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