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Zervo vs Zen Browser: catalog facts
Zervo	Zen Browser
Free Free and open source under the MPL-2.0 licence.	Free Free and open source, funded by donations.
Windows, macOS, Linux	Windows, macOS, Linux
Uses Servo rather than Chromium or Gecko Sidebar workspaces with several layouts	Vertical tabs, workspaces and split view built in, no extensions needed Firefox engine, so Firefox extensions and containers work
Some sites do not work because Servo is incomplete Linux and Windows builds are untested	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
No account 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.