Turn your smartphone into comfortable personal heart rate monitor. Measuring is based only on gyroscope sensor. How to measure your heart rate: * Sit on a chair and put the phone on your leg (quadriceps) or on heart side of chest or into armband * Relax and hold still, keep your hands along side of your body * Wait for detection of heart rate, it takes 10 - 15 s * That's all! Application is using google subscription licensing with 14 days free trial period. All features are available during free trial period. At the end of free trial period, you can choose if you pay or cancel the subscription.