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Mobile
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The only app I could find that specialized on this subject, the UI could be better and I wish that there were more noun and adjective combinations but it works fine for a free app of its quality
Using this app you can learn and practice all forms of adjective endings in German language. The noun can be maskulin (m.), feminin (f.), neutrum (n.), or plural (pl.), and its casus can be Nominativ (N.), Akkusativ (A.), Dativ (D.), or Genitiv (G.).