I have used this app along with the cerego website to study for my medical school board exams, USMLE Step 1 and 2. Cerego is superior to all other spaced repetition platforms because it is the only one that uses an intelligent algorithm to judge your mastery of each card instead of having you rate your mastery on a 1-5 scale, which is how platforms like Anki and Quizlet work. The Cerego algorithm figures out your mastery by the accuracy of your prior responses and how long you took to answer the question. The iOS app has run flawlessly on my iPhone and iPad and it integrates well with the Cerego website. Highly recommend it.
Cylack about Cerego