Compare software

Duden Mentor vs Refine: catalog facts
Duden Mentor	Refine
Free The online spelling check can be used free of charge.	Free Free to download and use without an account.
Web	macOS
Backed by the Duden reference for German spelling Runs in the browser with nothing to install	Grammar checking runs locally and works offline Every fix explains the rule behind it
German language only Requires an internet connection	macOS only, requires macOS 14 or later Local model quality depends on the Mac it runs on
Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Needs internet	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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