- Incredibly accurate in measuring heart rate - Easy to use, has intuitive design - Calculates your heart rate training zones - Free and unlimited - No additional hardware required - Supports Apple Health How to use application? - Just put your finger tip on the phone's camera and flash, tap "Start" and stay still. Heart rate will be shown in seconds. What is heart rate training zones? - The key in making fitness progress is to elevate your heart rate into the correct zone. App will calculate your heart rate training zones based on age and resting heart rate. * Store your results After each measurement you can save result in history, so that you can track measurements over time. * Tags Tags allow you mark your measurements and then easily find them in history. Not for medical use.