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Crest vs Zen Browser: catalog facts
Crest	Zen Browser
Free Free and open source under the MPL-2.0 licence.	Free Free and open source, funded by donations.
macOS, iOS	Windows, macOS, Linux
Spaces isolate cookies, history, tabs and credentials per context Chromium and WebKit engines on Mac with per-site rules	Vertical tabs, workspaces and split view built in, no extensions needed Firefox engine, so Firefox extensions and containers work
Early access software with no independent security audit Mac build is for Apple silicon only	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: MPL-2.0	License: MPL-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 21, 2026

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