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Web vs Dia: catalog facts
Web	Dia
Free Free to download and build from the published source.	Freemium A free tier is available. Heavier use requires a paid plan.
macOS	macOS
Native macOS interface Local AI page questions through MLX on the Mac	Assistant reads your open tabs, so questions do not need copy and paste
Requires Apple Silicon and macOS 26.5 or later Development preview with limited site compatibility testing	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
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 2, 2026	Official website Full listing and sources Checked September 22, 2026

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