Does anybody have a system for keeping track of how many plays that each player has played?

I coach an 8u team that has 23 players. According to our rules, each kid is required to play at least 12 plays.

It’s hard to keep track and I’m just wondering if anybody has a system or app or anything that helps them to keep track.

I appreciate the rule because I believe that any kid who goes through practice has a right to play.