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

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