This app helps you to track your shots, highlighting the holes by green circles and by blue circle the last shot, giving you the position of the last shot by voice and the total score. At this time the app works with ISSF 25 and 50 meters target and every targets that have a full black center including 7-8-9-10 score (but you can ask me to modify the app to supports other kind of targets). To work fine it needs to be very very stable. To avoid false detections the app can check the target after it listens the shot sound. The app can works for air shots and fire shots. The app is not developed for official competitions by for who have short sighted problems or for who need to have a real time situation.
It is important the holes have a great contrast.
Put the smartphone in landscape position, use the zoom in a such manner the target occupy the all display