- Home
- Grammar checkers
- Duden-Mentor
On the recordRead 20 Oct 202650 facts
Duden-Mentor
Plans and prices
Basis
Free
basic functions · personal bookmark with registration
Read 20 Oct 2026 · mentor.duden.de
Duden Pur
€2.99a month, billed yearly
ad- and tracking-free duden.de and app · personal bookmark
Read 20 Oct 2026 · mentor.duden.de
Premium
€7.95a month, billed yearly
250 text optimizations per month · selectable text type and style · Word add-in · Chrome, Firefox and Edge extensions
Read 20 Oct 2026 · mentor.duden.de
Premium Plus
€9.95a month, billed yearly
unlimited text optimizations per month · selectable text type and style · Word add-in · Chrome, Firefox and Edge extensions
Read 20 Oct 2026 · mentor.duden.de
Pur
€2.99a month
10 Test-Korrekturen/Umformulierungen pro Monat
Read 11 Oct 2026 · duden.de
On the record
- API authentication
- API access uses an x-api-key header and developers request keys by emailing Duden.api.duden.io · read 20 Oct 2026
- API delivery
- API v2 returns a correlation ID immediately and posts the processed result to a publicly reachable HTTPS callback URL.api.duden.io · read 20 Oct 2026
- API language options
- API v2 accepts german_DE, german_AT and german_CH variants and supports complete-result or sentence-segment callbacks.api.duden.io · read 20 Oct 2026
- API versions
- The public correction API provides v1 for spellchecking and synonyms and v2 for asynchronous AI correction and paraphrasing.api.duden.io · read 20 Oct 2026
- Browser extension
- Yesmentor.duden.de · read 20 Sep 2026
- Browser integrations
- Extensions work in Chrome, Firefox and Edge and can insert corrected text into services such as Gmail, WordPress, Trello, Facebook and Twitter.mentor.duden.de · read 20 Oct 2026
- Browser support
- Browser extensions are available for Chrome, Firefox and Microsoft Edge.mentor.duden.de · read 11 Oct 2026
- Business licensing
- Business plans use annual per-user licenses, and prices for more than 25 licenses are available on request.lp.mentor.duden.de · read 11 Oct 2026
- Company relationship
- Duden is a brand of Cornelsen Group and the Duden-Mentor Word add-in is supplied by Cornelsen Verlag GmbH.linkedin.com · read 20 Oct 2026
- Company size
- LinkedIn lists Duden in the 11–50 employee range and places its headquarters in Berlin.linkedin.com · read 20 Oct 2026
- Data hosting
- The business product page states that texts are sent using TLS 1.2 and a 128-bit key to AWS servers contractually located in Frankfurt, Germany.lp.mentor.duden.de · read 11 Oct 2026
- Desktop app
- Nomentor.duden.de · read 20 Sep 2026
- Grammar
- It checks German grammar and displays correction suggestions beneath the text.mentor.duden.de · read 20 Oct 2026
- Integrations
- The Word add-in supports Microsoft Word for macOS from version 2016 and Windows from version 2019.mentor.duden.de · read 11 Oct 2026
- Languages
- The service checks German texts only.lp.mentor.duden.de · read 11 Oct 2026
- Licence
- The Firefox extension is marked All Rights Reserved, so the product is proprietary rather than open source.addons.mozilla.org · read 20 Oct 2026
- Limit: comma accuracy
- An independent test reports that the tool sometimes removes useful commas or inserts commas in unsuitable positions.dkeu.de · read 20 Oct 2026
- Limit: document workflow
- An academic-focused review says the web editor has no file upload, loses formatting and footnotes when copying from Word, and requires corrections to be accepted individually.campuslektor.com · read 20 Oct 2026
