Learn how to use the app first!
I don’t review apps, but I felt inclined to respond to the rash of one star ratings of this app based on not using it correctly. This app is a great option to buying an overly expensive speed gun (which aren’t accurate either unless you know how to use one). That said, it will over rate the speed if you don’t choose the exact release point and crossing home plate point as the developer states in the instructions. This app is not a tap tap stop watch. I would also add filming 90° to the mound/plate (and filing at 240fps as recommended) so you can choose the exact position of the ball leaving the hand (or mound if the pitcher’s release point still needs work ;). The developer brilliantly incorporated the mathematics behind calculating speed over a very specific distance using slo-mo video. Great job!