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MaxAI vs HARPA AI: catalog facts
MaxAI	HARPA AI
Freemium Free to install, with paid plans on the pricing page.	Freemium Free to install, with paid plans for heavier use of hosted models.
Web, Browser extension	Browser extension
Works on the current page from a sidebar Access to several AI model providers	Works with many AI providers and local models YouTube, PDF and page summaries in place
Page content is sent to cloud AI services No Firefox extension listed	Mainly a Chrome extension Hosted models send page content to third-party AI providers
Web application, Browser extension	Browser extension
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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