Little League has created an official rulebook app. Get it here.
While SportsConnect doesn't offer any app you can use on your phone, you can visit the "Team Central" portion of the SportsConnect website to view your roster and create calendar events for your team.
All pitchers must follow the Little League pitch count rules:
https://www.littleleague.org/playing-rules/pitch-count/
Note that there are some weird exceptions, so be sure to read the entire section!