Some biofeedback apps help you to monitor your heart rate.
Biofeedback applications let you
iBiofeedback
IBiofeedback tracks your heart rate and integrates it into healing modules that help you meditate, recite mantras or simply relax. Each module adjusts its display or auditory delivery based on changes in your heart rate. To work to its fullest extent, iBioFeedback requires an external heart rate measurement sensor. However, the application also gives you the option of tapping