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Writefull vs Harper: catalog facts
Writefull	Harper
Freemium Pricing details are not given on the homepage.	Free Free and open source.
Windows, macOS, Web	macOS, Web, Browser extension, Command line
Feedback tailored to academic writing Works in Word and in Overleaf LaTeX	All checks run locally with no telemetry Works in browsers, editors and system-wide on macOS
Focused on academic English Requires an internet connection	English only Rule-based checks do not rewrite text the way AI assistants do
Downloadable app, Web application	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
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.