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Harper vs Scribens: catalog facts
Harper	Scribens
Free Free and open source.	Free The site describes the grammar checker as free to use.
macOS, Web, Browser extension, Command line	Android, iOS, Web, Browser extension
All checks run locally with no telemetry Works in browsers, editors and system-wide on macOS	Free English and French grammar checking Works inside email, social sites and office apps
English only Rule-based checks do not rewrite text the way AI assistants do	Needs an internet connection Text is checked on the service's servers
Downloadable app, Web application, Browser extension	Downloadable app, Web application, Browser extension
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 October 2, 2026

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