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Vivaldi vs Thorium: catalog facts
Vivaldi	Thorium
Free Free, funded by default search engine and bookmark placement deals.	Free The open-source software is available without a license fee. Hosting, hardware and…
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	Offers builds tailored to several instruction sets and platforms.
Not open source; only the modified Chromium parts are published The sheer number of settings takes real time to work through	You need to select a build compatible with your processor.
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: BSD-3-Clause
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 September 22, 2026

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