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Nook vs Dia: catalog facts
Nook	Dia
Free Free and open source, supported through Open Collective.	Freemium A free tier is available. Heavier use requires a paid plan.
macOS	macOS
Sidebar and spaces for organising tabs Runs both Chrome and Safari extensions	Assistant reads your open tabs, so questions do not need copy and paste
macOS only Young project, recently reached version 1.0	macOS only and requires an account The assistant sends page content to a remote service, which has privacy implications
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 22, 2026

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