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Vivaldi vs Nook: catalog facts
Vivaldi	Nook
Free Free, funded by default search engine and bookmark placement deals.	Free Free and open source, supported through Open Collective.
Windows, macOS, Linux, Android, iOS	macOS
Tab stacking, tiling and vertical tabs without a single extension Built-in mail, calendar and feed reader in a side panel	Sidebar and spaces for organising tabs Runs both Chrome and Safari extensions
Not open source; only the modified Chromium parts are published The sheer number of settings takes real time to work through	macOS only Young project, recently reached version 1.0
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
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 1, 2026

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