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Zen Browser vs Arc: catalog facts
Zen Browser	Arc
Free Free and open source, funded by donations.	Free Free to download and use. The software is closed source.
Windows, macOS, Linux	Windows, macOS
Vertical tabs, workspaces and split view built in, no extensions needed Firefox engine, so Firefox extensions and containers work	Spaces keep work, personal and project browsing genuinely separate Split view and the command bar make keyboard-driven browsing fast
Young project; interface changes between releases and bugs surface A small team maintaining a Firefox fork is a real long-term risk	The Browser Company has shifted its development focus to a newer browser, so Arc receives limited feature work No Linux build, and an account is required to use it
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.