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Dia vs Arc: catalog facts
Dia	Arc
Freemium A free tier is available. Heavier use requires a paid plan.	Free Free to download and use. The software is closed source.
macOS	Windows, macOS
Assistant reads your open tabs, so questions do not need copy and paste	Spaces keep work, personal and project browsing genuinely separate Split view and the command bar make keyboard-driven browsing fast
macOS only and requires an account The assistant sends page content to a remote service, which has privacy implications	The Browser Company has shifted its development focus to a newer browser, so Arc receives limited feature work No Linux build, and an account is required to use it
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	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 September 22, 2026

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