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Dia vs Nook: catalog facts
Dia	Nook
Freemium A free tier is available. Heavier use requires a paid plan.	Free Free and open source, supported through Open Collective.
macOS	macOS
Assistant reads your open tabs, so questions do not need copy and paste	Sidebar and spaces for organising tabs Runs both Chrome and Safari extensions
macOS only and requires an account The assistant sends page content to a remote service, which has privacy implications	macOS only Young project, recently reached version 1.0
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
Account 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.