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SigmaOS vs Arc: catalog facts
SigmaOS	Arc
Freemium A free tier is available. Heavier use moves to a paid subscription.	Free Free to download and use. The software is closed source.
macOS	Windows, macOS
Tabs live in named workspaces with separate logins, and each one can be marked done or locked, which…	Spaces keep work, personal and project browsing genuinely separate Split view and the command bar make keyboard-driven browsing fast
It is closed source, macOS-only, and the free tier is limited enough that regular use pushes you to…	The Browser Company has shifted its development focus to a newer browser, so Arc receives limited feature work No Linux build, and an account is required to use it
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account 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 22, 2026

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