SweetPickle

The SweetPickle scorekeeper app allows players to mentally focus more on their game and less on keeping track of the score and player positions (especially when stacking). It features the ability to choose whether you want to keep score by pressing buttons or swiping the screen to score the winner of each rally. The app includes a Doubles, Singles and Cutthroat mode. It also provides a feature that allows the user to switch on the Rally Scoring mode (feature only available while in Doubles mode). When the game is finished, you can send an SMS with the final score to anyone on your contact list. The colors and haptic feedback of the two main scoring buttons are customizable featuring the ability to use user-provided hex color codes.
On a design note, the app interface was designed with the idea that a player should not have to worry about precise button presses while in the heat of an intense game. Accordingly, the majority of the buttons on the screen are long-press (press and hold) buttons except for the the two large main scoring buttons for each of the two teams, located at the very top and very bottom of the screen. Ideally, the player can press the top or bottom of the screen without looking and know which team Score button was pressed based on the haptic feedback and distinct sounds assigned to the buttons, and also not have to worry about unintentionally pressing other buttons. Try it out in Apple's AssistiveTouch mode.