Duden-Mentor vs Grammarly

Duden-Mentor checks German text for spelling, grammar, punctuation, and style, then suggests corrections. It can flag filler words, repeated wording, and overly long sentences, with suggestions for readability. The service supports German variants for Germany, Austria, and Switzerland, but checks German only. Browser extensions are available for Chrome, Firefox, and Microsoft Edge, and the plug-in works in text fields on services including Gmail, Web.de, GMX.de, Trello, Facebook, and WordPress. A Microsoft Word add-in supports macOS from Word 2016 and Windows from Word 2019. An internet connection is required. Duden says text is encrypted in transit, not used for AI training, and deleted after checking. Basis is free and lists a 10-word personal dictionary and 500 characters without an account. Pur costs €2.99 a month, billed 35,88 € pro Jahr, with 10 test corrections or rewrites monthly. Premium costs €7.95 a month, billed 95,40 € pro Jahr, with 250 monthly text optimizations; Premium Plus costs €9.95 a month, billed 119,40 € pro Jahr, with unlimited optimizations. Paid plans are annually payable and annually cancellable.

Grammarly is a writing assistant from Grammarly, founded in 2009 and now part of Superhuman. Its listed tools include proofreading, paragraph rewrites, tone suggestions, a humanizer, and AI detector agents. Style suggestions and tone detection are listed, alongside brand voice controls and team collaboration. The Free plan is free and includes 100 AI prompts per month; Pro is $12 a month with 2,000 AI prompts per member per month. Plus is listed at ₹392 INR per member per month when billed annually, and ₹1,000 when billed monthly, and is available only via local payment methods. Grammarly lists 24 supported languages, browser compatibility with Chrome, Safari, Firefox, and Edge, and mobile apps for iPhone, iPad, and Android. Desktop apps and a browser extension are also listed. Grammarly says user content is not sold, monetized for advertising, or used to train third-party models. Its SOC 2 Type 2 report covers security, privacy, availability, and confidentiality controls.