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Vivaldi vs Catsxp: catalog facts
Vivaldi	Catsxp
Free Free, funded by default search engine and bookmark placement deals.	Free Free to download from the official site.
Windows, macOS, Linux, Android, iOS	Windows, macOS
Tab stacking, tiling and vertical tabs without a single extension Built-in mail, calendar and feed reader in a side panel	Continued support for Manifest V2 extensions Mouse gestures, super drag and boss key built in
Not open source; only the modified Chromium parts are published The sheer number of settings takes real time to work through	Closed source Small developer with discussion mostly in Chinese
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is 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.