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Dia vs SigmaOS: catalog facts
Dia	SigmaOS
Freemium A free tier is available. Heavier use requires a paid plan.	Freemium A free tier is available. Heavier use moves to a paid subscription.
macOS	macOS
Assistant reads your open tabs, so questions do not need copy and paste	Tabs live in named workspaces with separate logins, and each one can be marked done or locked, which…
macOS only and requires an account The assistant sends page content to a remote service, which has privacy implications	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
Account 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 22, 2026

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