When you first open the app, you must take a diagnostic test of 30 words. This test places you at an appropriate vocabulary level – from “White Belt” to “Black Belt.” You move up the ranking as you “master” more words. Once Black Belt is achieved, you will get “bonus words;” therefore, even if you place at an advanced level in the diagnostic, you will always be given additional words.
Words are organized into three different categories: Mastered; Current; Words Left (see icon above). Quizzes are available for both previously “mastered” words, as well as current words. Repetition is key to this app: you must correctly define a word on three different quizzes before it is considered “mastered.”
Once you have a couple hundred vocab words “mastered,” I recommend starting a Google doc or Excel spreadsheet that aggregates all similar definitions. This encourages the most efficacious vocabulary building. I also recommend regularly reviewing the “mastered” list within the app.
The cost is a flat fee of $4.99. It is definitely worth the investment.