Since a few months there is another option next to WOO and PIQ: The Surfr app. Why would you choose for another new device to measure jump height? It costs only 35 Euro’s for the mount and the app is free. The app relies on the measurements of a phone. But it isn’t the low price what makes the Surfr app interesting. Would you be brave enough to put in your expensive Iphone? We have seen already problems with the annoying mount. So better use an old phone in the case. Which thus adds up roughly to same costs of a new WOO. But What does makes the Surfr app superior over the WOO is the instant results on a big screen.