Just your heart rate on your Apple watch in the largest text that will fit! When you are running or cycling and you want to see your heart rate tiny text just will not do. Thats why we built Simple Heart Rate to provide easy to read access to your current heart rate by integrating with Apple HealthKit. You can also use the iPhone app to create multiple heart rate target zones to enhance your training experience. Simple Heart Rate makes a great companion app to a workout tracker running on your iPhone.