Turn your iPhone into an AI line umpire with the Tennis Line Call App. This innovative app allows you to challenge line calls with reliable results, similar to the Hawk-Eye system. With a high frame rate and a simple setup process, it's the perfect companion for every tennis player.

In addition to its line call challenge feature, the app also includes a free serve radar mode. This mode allows you to measure your tennis serve speed without the need for a radar or tracking gun. It's a fun and useful tool for friends, students, or even just for personal improvement.

Using the Tennis Line Call App is easy and convenient. Simply start the app and optionally sync up with your opponent using the QR code scanning feature. Then, set up your phone on a tripod facing your side of the court. When there is a questionable line call, you have 10 seconds to trigger a line challenge by raising your right arm for 3 seconds (beta) or using your Apple Watch. The app will display a steady flash for IN, a blinking flash for OUT, and the result will be audible. If you have an Apple Watch, you can also view the results and picture there.

Say goodbye to disagreements, cheating, and self-doubt about line calls during your tennis matches. The Tennis Line Call App ensures fair play and eliminates any uncertainties. Additionally, you can use the serve speed and In or Out analytics results to improve your game.

Please note that the app works best with iPhone 11 and above, providing an optimal experience for users of these devices.