With Vattenfall’s Serve-o-meter, you can serve with your iPhone like a tennis racket. By swinging the phone in the air you may find out the speed of your serve and how much kinetic energy that you created. The app was produced by The Mobile Life in conjunction with Vattenfall’s sponsorship of the Swedish Open tennis in Båstad, 2011.


  • Measuring the speed of your serve in km / h
  • Converts the kinetic energy in reserve to kilowatts.
  • Challenge your friends via Facebook.