Not for real musicians.
This app seems nice in principle, but it cant count very high. Its counting every Coltrane tune I put on in halftime (160 vs. the actual quarter note speed of 320, etc.). If the developers are going to charge four dollars for this, youd think they might have listened to a jazz album once or twice. If you play jazz, save your money.
WhyCantYouCount about
liveBPM - Beat Detector, v1.2.0