Compare software

Crest vs Dia: catalog facts
Crest	Dia
Free Free and open source under the MPL-2.0 licence.	Freemium A free tier is available. Heavier use requires a paid plan.
macOS, iOS	macOS
Spaces isolate cookies, history, tabs and credentials per context Chromium and WebKit engines on Mac with per-site rules	Assistant reads your open tabs, so questions do not need copy and paste
Early access software with no independent security audit Mac build is for Apple silicon only	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: MPL-2.0	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 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.