I bought this years ago. Couldn't tell you how long it was now. It's tracked hundred of board games, card games, suplexes by Brock Lesnar in a single match, the list goes on. I was sad to start getting the warnings that it wouldn't run in iOS 11.
Developer comes in after 4? 5? years of no updates (it legitimately DID NOT need updates, that's not a knock against it) and pushes a valid 64-bit application for iOS 11.
I can honestly say I've gotten the most use and distance out of ScorekeeperXL more than any other third part app since I bought my first iPhone 3GS. Hats off to the dev, wish apps today were more like yours -- simple, unobtrusive, and FAST.