As a musician ear training is perhaps one of the most overlooked steps on the learning curve. To really achieve a professional sound, having sharp ears is crucial. The problem is its usually not fun, and can get pain-stakingly boring. Im grateful for coming across this app as it makes ear training fun, simple and very effective. Build this into your daily routine, and you will reap the results in no time.
PS. Would really like to see an add-on feature for 1/3 octaves for complete mastery of the frequency spectrum!
Roach King about hearEQ: Ear training for EQ, v1.4.0