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HARPA AI vs Brave Leo: catalog facts
HARPA AI	Brave Leo
Freemium Free to install, with paid plans for heavier use of hosted models.	Free Built into the Brave browser, which is free to download.
Browser extension	Windows, macOS, Linux, Android, iOS
Works with many AI providers and local models YouTube, PDF and page summaries in place	Works on the page you are reading without copying text No account needed, and chats are not kept for training
Mainly a Chrome extension Hosted models send page content to third-party AI providers	Only available inside the Brave browser
Browser extension	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No 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 October 1, 2026

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