CardTrack works perfectly in conjunction with Martin Eisele's Vision app which will detect the order of the deck using the camera. Note: * CardTrack does its best to locate the selected card but may not always be accurate. This depends on the number of shuffles as well as the position of the replaced card. In testing, CardTrack works well with 2-3 riffle shuffles, but has also worked with 4 riffle shuffles + 1 overhand shuffle. * This app is for entertainment purposes only.