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Vivaldi vs Helium: catalog facts
Vivaldi	Helium
Free Free, funded by default search engine and bookmark placement deals.	Free Free and open source, supported by sponsors.
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	Ad, tracker and cookie banner blocking on by default No telemetry or background requests without consent
Not open source; only the modified Chromium parts are published The sheer number of settings takes real time to work through	Younger project than established privacy browsers Built on Chromium, so it follows Google's engine decisions
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
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 September 23, 2026

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