The app is good. Its easy to use and has a lot of ways mixed to learn the vocabulary. But what bothers me is that 1. There is no List of vocabulary already learned and you can't choose "I know/ don't know the word" 2. you always repeat 4 cards, for like 5mins and it gets boring because of course after repeating the same 4 you'll know the words for the moment. However I found no repetition for the cards, how am I supposed to practise the words I diddnt remember smoothly?