"قواعد اللغة الألمانية: المفرد" is a free Android app developed by Paloo Apps that aims to help users learn German grammar. The app focuses on teaching users the plural forms of German nouns by providing shortcuts and exercises to practice hundreds of important words.

The app's interface is simple and easy to navigate. Users can choose from a list of categories and subcategories to learn the plural forms of nouns. The app includes a search function that allows users to find specific words they want to practice. The "My Progress" tab keeps track of the user's progress and provides feedback on their performance.

Overall, "قواعد اللغة الألمانية: المفرد" is a useful app for those who want to improve their German grammar skills. The app's focus on plural forms of nouns and its user-friendly interface make it a great option for beginners and intermediate learners alike.