German Deutsch Niemiecki Testd is a free Android app developed by Testdeutsch. It is an educational app that helps users learn German grammar and vocabulary. The app is compatible with Android 13.0 and higher.

The app offers various exercises to improve grammatical and lexical skills. The exercises include multiple-choice questions, fill-in-the-blank, and sentence completion. The app also features flashcards for users to learn new words and phrases. The interface is user-friendly and simple to navigate.

Overall, German Deutsch Niemiecki Testd is an excellent app for those who want to learn German or improve their grammar and vocabulary skills. The app is free, easy to use, and provides a variety of exercises to help users learn the language.