Available for both iOS and Android devices, using the app is as simple as pointing it at a soccer ball that's then dropped onto a hard surface. BallTune records a video and then analyzes the sound and frequency of bounces to calculate the ball's PSI, allowing you to then tune adjust it for a specific behavior based on recommendations in the app.

Normally the app will run just two bucks, but because the World Cup is currently on, it's free for a limited time. And eventually its creators plan to release versions for basketballs and volleyballs too. [BallTune]