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