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SigmaOS vs Vivaldi: catalog facts
SigmaOS	Vivaldi
Freemium A free tier is available. Heavier use moves to a paid subscription.	Free Free, funded by default search engine and bookmark placement deals.
macOS	Windows, macOS, Linux, Android, iOS
Tabs live in named workspaces with separate logins, and each one can be marked done or locked, which…	Tab stacking, tiling and vertical tabs without a single extension Built-in mail, calendar and feed reader in a side panel
It is closed source, macOS-only, and the free tier is limited enough that regular use pushes you to…	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
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 21, 2026

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