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QuillBotHarper
Freemium

Free to use with limits, with a Premium subscription for more.

 Free

Free and open source.

Windows, Android, iOS, Web, Browser extension macOS, Web, Browser extension, Command line
  • Many writing tools in one place
  • Extensions for Chrome, Edge and Safari
  • All checks run locally with no telemetry
  • Works in browsers, editors and system-wide on macOS
  • Advanced modes need a Premium subscription
  • Text is processed on QuillBot's servers
  • English only
  • Rule-based checks do not rewrite text the way AI assistants do
Downloadable app, Web application, Browser extension Downloadable app, Web application, Browser extension
Closed source Open source
License not stated License not stated
Not stated if an account is needed Not stated if an account is needed
Needs internet Works offline

Checked September 23, 2026

Checked September 26, 2026

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