I use the GB App in a number of different ways:
First; The in-app graph lets me instantly know how my control is going over the course of the past week or so and how the number of carbs consumed has affected the ranges for certain days.
Second; All of the data is located on the website, therefore it is very easy for me to view the graphs by day, 7day, 30day, 90day and to use this information as I create the "doctors report". I have previously addressed this information and it can be found by doing a tag search on "doctors report".
These are only two ways that I use the App, there are several more. I hope the information is helpful to you.
Welcome to the Forum!
Good luck with your control and management!