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SigmaOS vs Opera Air: catalog facts
SigmaOS	Opera Air
Freemium A free tier is available. Heavier use moves to a paid subscription.	Free Free to use.
macOS	Windows, macOS
Tabs live in named workspaces with separate logins, and each one can be marked done or locked, which…	Ads and notifications hidden by default Built-in break and focus prompts
It is closed source, macOS-only, and the free tier is limited enough that regular use pushes you to…	Proprietary Focus features may feel unnecessary to users who want a plain browser
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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