It is a Cloud Counter. you can use it on one mobile phone, it will upload the number to the cloud. When you use it on another mobile phone with same name, it will automatically download same number from cloud so as to continue to add or subtract seamlessly.
For example
Your children want to earn the prize from you, they must behave well in order to get points. One good performance deserves one point.
Whether mother or father use this app on different mobile phones, they will get the same number.