First things first, the most important thing you can do is take an interest in your players and care about them. I can’t stress more the importance of the analogy “if a flower is wilting, don’t blame the flower”. They are all people going through things in their life. If they aren’t performing the way you expect, have open honest communication with them.
I also definitely recommend getting a copy of this book.
Found this, looks ok, two games this weekend so will try it out. Thanks for all the responses.
SubTime app can be downloaded at iPhone: https://itunes.apple.com/us/app/subtime-play-time-and-sub-tracking-for-coaches/id1248650528 Android: https://play.google.com/store/apps/details?id=com.gametimes
I'm used ball'n stats. I think it's good, it's easy to use and understand also if you ask a parent to do it. https://play.google.com/store/apps/details?id=apptimized.android.stats.basketball
But that was years ago, not using any stats program at the moment and because of your question I started searching in the google Play store and there are so many new ones. You can see for yourself. I'm almost sure you will find something you like. Nevertheless I'm following this question, maybe someone had a great tip :-) https://play.google.com/store/search?q=basketball%20stats&c=apps