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SigmaOS vs Nook: catalog facts
SigmaOS	Nook
Freemium A free tier is available. Heavier use moves to a paid subscription.	Free Free and open source, supported through Open Collective.
macOS	macOS
Tabs live in named workspaces with separate logins, and each one can be marked done or locked, which…	Sidebar and spaces for organising tabs Runs both Chrome and Safari extensions
It is closed source, macOS-only, and the free tier is limited enough that regular use pushes you to…	macOS only Young project, recently reached version 1.0
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	No 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 October 1, 2026

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