A free app for Android, by smartTech3.

The Xiaomi Mi Watch is an android wear watch that can be used to keep an eye on your health. It has a 1.39-inch high-resolution display, which allows you to see the details of your health, such as heart rate, oxygen saturation, etc. It also has a built-in pedometer to count your steps and track the number of calories you burn everyday. 

This application is developed by a company with a lot of experience in developing software for smartwatches, such as the Xiaomi Mi band.

It is free to use, and you can download it on your phone or tablet.