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Nook vs Vivaldi: catalog facts
Nook	Vivaldi
Free Free and open source, supported through Open Collective.	Free Free, funded by default search engine and bookmark placement deals.
macOS	Windows, macOS, Linux, Android, iOS
Sidebar and spaces for organising tabs Runs both Chrome and Safari extensions	Tab stacking, tiling and vertical tabs without a single extension Built-in mail, calendar and feed reader in a side panel
macOS only Young project, recently reached version 1.0	Not open source; only the modified Chromium parts are published The sheer number of settings takes real time to work through
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 21, 2026

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