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Zen Browser vs Shift: catalog facts
Zen Browser	Shift
Free Free and open source, funded by donations.	Freemium A limited free tier is available. More accounts and spaces require a paid subscription.
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	Several accounts of the same service signed in at once, separated by space
Young project; interface changes between releases and bugs surface A small team maintaining a Firefox fork is a real long-term risk	Most spaces and account slots require a paid plan Closed source and memory-hungry
Downloadable app	Downloadable app
Open source	Closed source
License: MPL-2.0	License not stated
No account needed	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 22, 2026

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