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Scribens vs Harper: catalog facts
Scribens	Harper
Free The site describes the grammar checker as free to use.	Free Free and open source.
Android, iOS, Web, Browser extension	macOS, Web, Browser extension, Command line
Free English and French grammar checking Works inside email, social sites and office apps	All checks run locally with no telemetry Works in browsers, editors and system-wide on macOS
Needs an internet connection Text is checked on the service'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
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 26, 2026

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