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Harper vs Writefull: catalog facts
Harper	Writefull
Free Free and open source.	Freemium Pricing details are not given on the homepage.
macOS, Web, Browser extension, Command line	Windows, macOS, Web
All checks run locally with no telemetry Works in browsers, editors and system-wide on macOS	Feedback tailored to academic writing Works in Word and in Overleaf LaTeX
English only Rule-based checks do not rewrite text the way AI assistants do	Focused on academic English Requires an internet connection
Downloadable app, Web application, Browser extension	Downloadable app, Web application
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Works offline	Needs internet
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 26, 2026

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