Compare software

Harper vs Refine: catalog facts
Harper	Refine
Free Free and open source.	Free Free to download and use without an account.
macOS, Web, Browser extension, Command line	macOS
All checks run locally with no telemetry Works in browsers, editors and system-wide on macOS	Grammar checking runs locally and works offline Every fix explains the rule behind it
English only Rule-based checks do not rewrite text the way AI assistants do	macOS only, requires macOS 14 or later Local model quality depends on the Mac it runs on
Downloadable app, Web application, Browser extension	Downloadable app
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked October 1, 2026

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