Compare software

HARPA AIChatGPTBox
Freemium

Free to install, with paid plans for heavier use of hosted models.

 Free

Free and open source; model providers may charge for API use.

Browser extension Browser extension
  • Works with many AI providers and local models
  • YouTube, PDF and page summaries in place
  • Works on any web page
  • Open source with an active community
  • Mainly a Chrome extension
  • Hosted models send page content to third-party AI providers
  • Needs access to a model provider such as ChatGPT or an API
  • Repository moved, so older links point to the previous owner
Browser extension Browser extension
Closed source Open source
License not stated License: MIT
Not stated if an account is needed Not stated if an account is needed
Needs internet Not stated if it works offline

Checked September 23, 2026

Checked October 2, 2026

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