This app is really good for learning and drilling vocabulary, declining nouns and practising conjugating verb forms. The content is considerable and the level of training is in-depth. One cannot quibble too much with the basic concept. So why didn't I give it 5 stars? Well some improvements could be made. For one the vocabulary testing should be based on word- frequency studies, which is apparently not the case now. You should start off with the most common words in the language and gradually progress to the less common ones. Next, I would like to see some way of Favouriting particular words you want to test later into a separate list. That would be a splendid and extremely useful feature as at the moment you can only keep drilling a word by staying on the same level all the time. Then I would like the option of adding your own words. Then I would like to see other ways of testing you on the words than mere multiple choice, which isn't necessarily always the strongest way, such as by making you type in German counterparts of the English words. That really would be challenging. Finally the app includes 180 model verbs fully conjugated as a reference. I would like to see many more verbs than this (some store apps have 1500+) and the ability to search them. What a powerful reference tool that would be. Overall, then, this is a superb app and very useful in improving your German vocabulary and testing some aspects of your grammar knowledge. A few extra features and it would easily warrant 5 stars. But even now for the price it's an absolute steal!