Compare software

Vivaldi vs Otter Browser: catalog facts
Vivaldi	Otter Browser
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, Linux
Tab stacking, tiling and vertical tabs without a single extension Built-in mail, calendar and feed reader in a side panel	Brings traditional desktop browser controls into a Qt application.
Not open source; only the modified Chromium parts are published The sheer number of settings takes real time to work through	Some planned features remain unfinished.
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
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.