You can use the paid plan by logging into your iPhone device with the same Apple ID you used at the time of purchase.
With simple operations, you can mesh undulations in inch units, color-code the height differences, and visualize slopes with arrows in an easy-to-understand manner.
In addition, you will receive one month free only when you purchase a subscription for the first time.
*If a communication failure occurs or the date and time on your device is incorrect, you will not be able to use this service.
It can also read the distance between the cup and the ball, making it the only application that can collect these green information.