Compare software

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

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