In creating an app, I would create one for my team (players). The app would be based on plays. My players have a hard time sometimes running the plays we have out to the end, or seeing the openings I see in the plays. I will have an app that you can upload real game time footage and practice footage. My players will be able to watch the footage on the app anytime, slow it down and compare practice footage and game time footage. That will allow them to realize their mistakes and make corrections, it will also allow players to see openings I try to tell them about.