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Helium vs Zen Browser: catalog facts
Helium	Zen Browser
Free Free and open source, supported by sponsors.	Free Free and open source, funded by donations.
Windows, macOS, Linux	Windows, macOS, Linux
Ad, tracker and cookie banner blocking on by default No telemetry or background requests without consent	Vertical tabs, workspaces and split view built in, no extensions needed Firefox engine, so Firefox extensions and containers work
Younger project than established privacy browsers Built on Chromium, so it follows Google's engine decisions	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: GPL-3.0	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 September 23, 2026	Official website Full listing and sources Checked September 21, 2026

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