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Dia vs Perplexity Comet: catalog facts
Dia	Perplexity Comet
Freemium A free tier is available. Heavier use requires a paid plan.	Freemium A free tier is available. Full agent features require a Perplexity subscription.
macOS	Windows, macOS
Assistant reads your open tabs, so questions do not need copy and paste	Assistant can act on pages, not only summarise them
macOS only and requires an account The assistant sends page content to a remote service, which has privacy implications	Requires a Perplexity account, and an agent acting on logged-in sites carries real risk Closed source
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.