HeartBeat is a free Android application developed by TuanTer, designed to help you measure your heart rate without using specialized devices. With HeartBeat, you can easily track your heart rate by using your phone's camera and flash to monitor changes in capillaries at your fingertips.

One of the most significant features of HeartBeat is its simplicity. You don't need any additional equipment or accessories to use this app, and it's effortless to use. Just open the app, place your fingertip on the camera lens, and wait for a few seconds to get your heart rate reading. HeartBeat also allows you to keep track of your heart rate history, which can help you monitor your fitness level over time.

Overall, HeartBeat is an excellent application for anyone who wants to track their heart rate without having to use specialized devices. It's easy to use, accurate, and provides a useful history of your heart rate measurements.