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Duden Mentor vs DeepL: catalog facts
Duden Mentor	DeepL
Free The online spelling check can be used free of charge.	Freemium Free translator and free API key, with paid plans for more usage and features.
Web	Windows, macOS, Android, iOS, Web, Browser extension
Backed by the Duden reference for German spelling Runs in the browser with nothing to install	Translates whole documents as well as text Writing assistant and live voice translation alongside the translator
German language only Requires an internet connection	Text is processed on DeepL's servers Many features and higher limits need a paid plan
Web application	Downloadable app, Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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