Duden Mentor

Duden Mentor is a German-language writing assistant launched in 2020 by the Cornelsen Group, the publisher behind Duden -- Germany's most authoritative dictionary and the definitive reference for German spelling and grammar since 1880. Built on over 140 years of linguistic expertise, Duden Mentor leverages this unmatched corpus of German language knowledge to provide grammar checking, style suggestions, and spelling corrections that are considered the gold standard for the German language.

The platform offers comprehensive German grammar checking with particular strength in complex comma rules, a notorious pain point in German writing. Duden Mentor provides style suggestions to improve readability, synonym recommendations for richer vocabulary, and premium corrections that go beyond basic spell-checking. The tool is available through a web editor, browser extensions for Chrome and Firefox, and a Microsoft Word add-in, making it accessible across common writing workflows. An API is also available for developers who want to integrate Duden's linguistic capabilities into their own applications.

Headquartered in Berlin, Germany, Duden Mentor processes all text exclusively on German servers, ensuring complete GDPR compliance and data sovereignty. The platform offers a free tier with basic checking capabilities and premium plans that unlock advanced corrections, longer text support, and additional features. For German-speaking professionals, businesses, and writers who need a writing assistant that truly understands the nuances and rules of the German language at a native level, Duden Mentor offers an authority and depth that no US-based tool like Grammarly can match for German content.