Ideal for the iPad Pro, the Bagel app lets you display the score of a tennis match in real time. Place your iPad courtside, and connect a smart button to track the score as you play.
When playing matches without an umpire, players have to keep the score themselves. With a live scoreboard you can avoid disagreements as all players can see the iPad scoreboard updated after each point.
Have kids playing tennis? Place an iPad courtside with the Bagel app to increase the fun and let everyone see the score as a match progresses.