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Vivaldi vs SigmaOS: catalog facts
Vivaldi	SigmaOS
Free Free, funded by default search engine and bookmark placement deals.	Freemium A free tier is available. Heavier use moves to a paid subscription.
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	Tabs live in named workspaces with separate logins, and each one can be marked done or locked, which…
Not open source; only the modified Chromium parts are published The sheer number of settings takes real time to work through	It is closed source, macOS-only, and the free tier is limited enough that regular use pushes you to…
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
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.