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Dia vs Crest: catalog facts
Dia	Crest
Freemium A free tier is available. Heavier use requires a paid plan.	Free Free and open source under the MPL-2.0 licence.
macOS	macOS, iOS
Assistant reads your open tabs, so questions do not need copy and paste	Spaces isolate cookies, history, tabs and credentials per context Chromium and WebKit engines on Mac with per-site rules
macOS only and requires an account The assistant sends page content to a remote service, which has privacy implications	Early access software with no independent security audit Mac build is for Apple silicon only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MPL-2.0
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 October 2, 2026

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