Duden-Mentor vs MerciApp

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.

MerciApp is an AI writing assistant for spelling, grammar, context, and style corrections, with tools for rewriting text. Smart Autocorrect addresses errors in spelling, structure, and grammar as users type. Transform offers ready-made and customizable assistants for rewriting, structuring, and translation, while Dynamic Snippets insert reusable or personalized text using keyboard shortcuts. The browser extension works with Chrome, Firefox, and Edge and integrates with tools including Gmail, Slack, Facebook, WordPress, Salesforce, and HubSpot. Word and Outlook extensions are also available. MerciApp Correct supports French, Spanish, Italian, German, and Portuguese. The maker says texts are not used to train its AI and says data is hosted in France, kept private, and not shared with third parties. The free plan analyzes 600 words per day and allows three Transform rewrites per day. Assist costs €12 a month, with an annual option shown at 144€/year per seat; Enterprise requires at least 20 seats, with no price listed.