Really well done app.
It contains the patterns up to 4th dan. The app developper even included a suggestion to have a video insert to show whats happening when the instructor has his back facing the camera. The ability to view a video as well as view still images of any pattern makes this the ultimate learning tool as one can see clearly the stances/blocks/attacks and view the transition between moves.
I am a current practioner at the 2nd dan level and I highly recommend this app to anybody practicing Tae Kwon Do (from white to black belts)!!!
You will be extremely satisfied with your purchase.
CoolGuyReview about iTaekwondo