Compare software

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