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Vivaldi vs Zen Browser: catalog facts
Vivaldi	Zen Browser
Free Free, funded by default search engine and bookmark placement deals.	Free Free and open source, funded by donations.
Windows, macOS, Linux, Android, iOS	Windows, macOS, Linux
Tab stacking, tiling and vertical tabs without a single extension Built-in mail, calendar and feed reader in a side panel	Vertical tabs, workspaces and split view built in, no extensions needed Firefox engine, so Firefox extensions and containers work
Not open source; only the modified Chromium parts are published The sheer number of settings takes real time to work through	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
Closed source	Open source
License not stated	License: MPL-2.0
No account needed	No account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 21, 2026

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