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Zen Browser vs Zervo: catalog facts
Zen Browser	Zervo
Free Free and open source, funded by donations.	Free Free and open source under the MPL-2.0 licence.
Windows, macOS, Linux	Windows, macOS, Linux
Vertical tabs, workspaces and split view built in, no extensions needed Firefox engine, so Firefox extensions and containers work	Uses Servo rather than Chromium or Gecko Sidebar workspaces with several layouts
Young project; interface changes between releases and bugs surface A small team maintaining a Firefox fork is a real long-term risk	Some sites do not work because Servo is incomplete Linux and Windows builds are untested
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: MPL-2.0
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 2, 2026

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