It is a number handler.
It can be used for checking the number of people, when counting things in large quantities.
You can also calculate the counted number.
If you use the memory function at the time of interruption of work,
Even if you exit the application you call it OK! It is a counter.
Also, please keep in mind that counting may not be heard depending on the volume of the music itself when counting while playing music.
With Family Sharing set up, up to six family members can use this app.