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Vivaldi vs Fast Internet Browser: catalog facts
Vivaldi	Fast Internet Browser
Free Free, funded by default search engine and bookmark placement deals.	Free Installed from the Microsoft Store; the site does not mention a price.
Windows, macOS, Linux, Android, iOS	Windows
Tab stacking, tiling and vertical tabs without a single extension Built-in mail, calendar and feed reader in a side panel	Runs on Xbox as well as Windows PCs Built-in ad blocker
Not open source; only the modified Chromium parts are published The sheer number of settings takes real time to work through	Users report slowdowns with more than four tabs open Developer and engine are not stated on the site
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	Needs internet
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.