The app has a lot of potential, however it omits the ability to make comments or annotations to the diagrams. There is a tangible product on the market that offers sillier diagrams and is sold as "shot pad", and it is my belief that this is what the developers were aiming for. I'm not a fan dispute the informative diagrams. Your best friend as a pool player other than your diagrams and books is a notepad. The absence of this function cripples this app, and in hope to see an update soon.