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Zen Browser vs Crest: catalog facts
Zen Browser	Crest
Free Free and open source, funded by donations.	Free Free and open source under the MPL-2.0 licence.
Windows, macOS, Linux	macOS, iOS
Vertical tabs, workspaces and split view built in, no extensions needed Firefox engine, so Firefox extensions and containers work	Spaces isolate cookies, history, tabs and credentials per context Chromium and WebKit engines on Mac with per-site rules
Young project; interface changes between releases and bugs surface A small team maintaining a Firefox fork is a real long-term risk	Early access software with no independent security audit Mac build is for Apple silicon only
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: MPL-2.0
No account needed	Not stated if an account is 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 2, 2026

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