High School Teacher Creates New Educational App

This could be useful for my 1st grade class by creating an app, where I could get them into 3 to 4 groups and compete against each other. I haven't thought much about creating an app, because I never knew about this. I will be working on creating one for the class to get them involve with fun stuff and still learning at the same time.
This is a Link to what I am using for; Creating App