EasyServe

By Renaud Deschenes on AppTrack Ninja.

Tennis serve speed by sound

EasyServe turns your phone into a serve radar. Prop it on the net band, walk back, and serve. It hears the racket and the bounce, times the flight, and tells you how fast you hit it. No extra hardware. No sensors on your racket. No subscription. HOW IT WORKS Your serve makes two sounds: the strike and the bounce. EasyServe measures the gap between them and works backwards through the ball's flight, accounting for air drag, to get your speed. All of it happens on your phone. SEE IT WHILE YOU PLAY Turn the phone around and the screen faces the court, so your speed flashes up in numbers big enou…

Categories: Sports, Health & Fitness

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