Heart Rate Monitor is a free Android app developed by HR Checker Beat Analyzer. As the name suggests, this app allows you to check your heart rate using your smartphone in less than 10 seconds. You don't need a dedicated heart rate monitor anymore, as you can simply use your phone's camera flash to get the results.

To use the app, you need to place your fingertip completely over the camera lens and press gently. The app will then use the camera flash to detect your heart rate. It's important to note that pressing too hard can reduce blood flow and make it harder to get a result, so be gentle. Also, make sure that your fingers are not cold.

This app is great for recreational and fitness use only. It's a quick and easy way to check your heart rate, but it's not intended for medical use. Overall, Heart Rate Monitor is a useful tool to have on your phone if you're interested in monitoring your heart rate on a regular basis.