Roster — add every player once, with a jersey number. Mark anyone who is missing this week as unavailable and they will be left out of the plan.
Setup — choose the formation and how long a quarter runs.
Lineups — builds the four quarters for you, sharing minutes as evenly as the numbers allow. Drag a player to swap them; the minutes update as you do.
Export — a printable card for the touchline, and a file you can keep. Everything lives on this device only, so export is also your backup.
The timer runs a quarter and records who was on. If somebody arrives late or goes off, change the roster and rebuild — nothing is locked in.