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Zen Browser vs Helium: catalog facts
Zen Browser	Helium
Free Free and open source, funded by donations.	Free Free and open source, supported by sponsors.
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	Ad, tracker and cookie banner blocking on by default No telemetry or background requests without consent
Young project; interface changes between releases and bugs surface A small team maintaining a Firefox fork is a real long-term risk	Younger project than established privacy browsers Built on Chromium, so it follows Google's engine decisions
Downloadable app	Downloadable app
Open source	Open source
License: MPL-2.0	License: GPL-3.0
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 September 23, 2026

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