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HARPA AI vs Perplexity Comet: catalog facts
HARPA AI	Perplexity Comet
Freemium Free to install, with paid plans for heavier use of hosted models.	Freemium A free tier is available. Full agent features require a Perplexity subscription.
Browser extension	Windows, macOS
Works with many AI providers and local models YouTube, PDF and page summaries in place	Assistant can act on pages, not only summarise them
Mainly a Chrome extension Hosted models send page content to third-party AI providers	Requires a Perplexity account, and an agent acting on logged-in sites carries real risk Closed source
Browser extension	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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