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ChatGPTBox vs HARPA AI: catalog facts
ChatGPTBox	HARPA AI
Free Free and open source; model providers may charge for API use.	Freemium Free to install, with paid plans for heavier use of hosted models.
Browser extension	Browser extension
Works on any web page Open source with an active community	Works with many AI providers and local models YouTube, PDF and page summaries in place
Needs access to a model provider such as ChatGPT or an API Repository moved, so older links point to the previous owner	Mainly a Chrome extension Hosted models send page content to third-party AI providers
Browser extension	Browser extension
Open source	Closed source
License: MIT	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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