Finally! I spent hours looking for an app that does just what this one does. Most other apps are unfunctional, don't work offline and ugly but this one seems perfect. The only problem that I can mentio is that it is hard to find... There is space to improve though... First of all, spelling maybe. There is no such word in english as "vocable" it is vocabulary (or vocab in short) Therefore, you should maybe reconsider the name of the app too. It might be some artistic decision but to me it is just plain dumb. There could be a search option for all the words I entered so far. More options for quizzes. One could be that it just shows the word and the person has to write down the meaning. We should be able to pair each word with a picture maybe to create some really cool flash cards. Maybe an option to record the pronounciation but that would be just a fancy add-on :-D . But the number one thing you should focus on is your SEO, because currently it is really hard to find the app even though it is a great one... From top of my head you could optimize for the keywords: personal dictionary, vocabulary list, do it yourself dictionary, self-made dictionary
Vocabletrainer at Google Play market analyse