Not so hot.
Barely any instructions. Relying on a human to tap a button in perfect synch with a server hitting the ball and receiver returning leaves waaaay too much room for error. Then you have to approximate distance traveled etc. Might as well use a stopwatch and do the math. I expected this would take advantage of the user’s camera to analyze live in real time using sound and visual input. Pretty much a waste of time.
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Useless
The app requires you to select the distance between the server and the receiver from pre-programmed lengths. The maximum is 66.5 feet. But a tennis court is 78 feet long, and often receivers stand well behind the baseline.
Good, not great.
For a free app, it’s nice. Lots of room for human error, since you can’t slow videos down or go frame by frame. But it can give a decent general idea of how fast a serve went if you do it multiple times per serve. Can’t complain - works better than some of the paid apps.
Not accurate
Relies on finger tap speed when ball is struck and again when it reaches the opponent so each tap could be milliseconds or even a tenth out which will make a huge difference in the speed calculations. Also you have to set the distance measurements, again this can cause inaccuracies. I see no point in this app for use in tennis.
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