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Dia vs Opera Neon: catalog facts
Dia	Opera Neon
Freemium A free tier is available. Heavier use requires a paid plan.	Paid Offered as a paid subscription.
macOS	Windows, macOS
Assistant reads your open tabs, so questions do not need copy and paste	Several agents for different kinds of tasks Can read and act on the pages you have open
macOS only and requires an account The assistant sends page content to a remote service, which has privacy implications	Closed source Agent features depend on online AI services
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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