Ball guides
Plain, checked answers about balls, bounce and when to replace them.
How to tell if a tennis ball is dead
Four ways to check if a tennis ball is dead, from the official 100 inch drop test to a squeeze test, and what the numbers mean.
Read the guide PadelHow to tell if a padel ball is dead
How the official padel ball test works, the 135 to 145 cm rebound rule, and simple ways to check your padel balls at the court.
Read the guide PickleballHow to tell if a pickleball is worn out
The official pickleball bounce test (30 to 34 in from 78 in), the signs of a worn ball, and how many games a pickleball lasts.
Read the guide TennisDo tennis ball pressurizers work?
How tennis and padel ball pressurizers work, what the evidence says, and how to check whether yours is keeping your balls alive.
Read the guide TennisTennis ball types and the ITF rebound test
What Type 1, Type 2, Type 3, high altitude and pressureless tennis balls are, which court each is for, and how the ITF tests them.
Read the guide PadelPadel balls vs tennis balls: the real differences
Padel and tennis balls look the same but are not. Size, weight, bounce and rules side by side, from the FIP and ITF specs.
Read the guide BallCheckHow BallCheck measures bounce from sound
The physics behind BallCheck: timing each bounce by sound to work out the coefficient of restitution (COR), and how it is compared with a new ball.
Read the guideBe first on court with BallCheck
Join the waitlist and we will email you the day the app launches.