The app is designed for students who are beginners through to around GCSE level (i.e. the first few years of a typical school French course). The vocabulary, divided into around 20 topics, is chosen to coincide with UK GCSE syllabuses, but with some adaptations to suit US learners. For a list of some of the topics, please see the App store description above.
As I'm planning regular updates for the app, I am eager to hear people's feedback. For that reason, as well as the usual App store facility to review the app, the program contains a "feedback" button where you can leave your comments/suggestions.