Duden-Mentor vs Grammar Guru
Duden-Mentor
mentor.duden.deGrammar Guru
grammarguruai.comSide by side
| Figure | Duden-Mentor | Grammar Guru |
|---|---|---|
| Price from | €2.99/mo | $1/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | — | Yes |
| API | Yes | — |
| Plans published | 8 | 4 |
| Spec score · Grammar checkers | 9.4 (#1) | 9.3 (#5) |
| Browser extension | Yes | Yes |
| Browser support | Browser extensions are available for Chrome, Firefox and Microsoft Edge. | The extension supports Chrome 88 or later and Edge 88 or later; Firefox and Safari extensions are described as in development. |
| Desktop app | No | Yes |
| Free plan | Yes | Yes |
| Integrations | The Word add-in supports Microsoft Word for macOS from version 2016 and Windows from version 2019. | The maker lists Gmail and Google Docs support for Chrome and Outlook and Office 365 support for Edge. |
| Mobile app | No | No |
| Rating on Chrome Web Store | 3.3 out of 5 from 75 ratings | 3.0 out of 5 from 2 ratings. |
| Security | The maker says texts are transmitted encrypted, are not used for AI training, and are deleted after checking. | The privacy policy states that data is encrypted in transit and at rest, access is controlled, and regular security audits are conducted. |
| Style suggestions | Yes | Yes |
Plans
Duden-Mentor
- BasisFree
- BasisFree
- Duden Pur€2.99 a month
- Pur€2.99 a month
- Premium€7.95 a month
- Premium€7.95 a month
- Premium Plus€9.95 a month
- Premium Plus€9.95 a month
Grammar Guru
- FreeFree
- Standard$1 a month
- Windows App$1 a month
- EnterprisePriced on request
In their own words
Duden-Mentor
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.
Grammar Guru
Grammar Guru has no write-up on Specifiction yet; its figures are above.