This application is beautifully designed, and easily communicates some rather difficult ideas. However, there are two fatal flaws that make it virtually useless and very detrimental to students. Unfortunately, the auditory intervals do not match the printed intervals. This glitch is rather fatal, since the whole point of the app is to learn how to recognize and identify both written and aural intervals. Second, there is no distinction between a major, minor, augmented, or diminished interval. Although the words sound advanced, the skills are extremely basic and do need to be taught from step one, otherwise students are learning incorrect information.
As a music educator and graduate of a major conservatory, i would use this app nearly everyday in my classroom and reccomend it very highly to my students if these issues were straightened out. In it's current state, i have to do quite the opposite, because using this app does more damage than good since the material it is teaching is not accurate.