One of the most interesting features of the Samsung Galaxy S5 was the heart rate sensor but did you know that, almost all smartphones has a heart rate monitor? Yes, all you need is a smartphone with a camera with LED flash and an app. With apps like Runtastic Heart Rate and Instant Heart rate, you can measure your heart rate by just placing your index finger to the camera and flash. Yep, it’s accurate. No need to buy the Samsung Galaxy S5 or a Samsung Gear Fit to know your heart rate. These apps might measure your heart rate but unfortunately, these apps can’t measure how heartbroken you are right now.