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Vivaldi vs Zervo: catalog facts
Vivaldi	Zervo
Free Free, funded by default search engine and bookmark placement deals.	Free Free and open source under the MPL-2.0 licence.
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	Uses Servo rather than Chromium or Gecko Sidebar workspaces with several layouts
Not open source; only the modified Chromium parts are published The sheer number of settings takes real time to work through	Some sites do not work because Servo is incomplete Linux and Windows builds are untested
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MPL-2.0
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 October 2, 2026

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