Game ScoreKeeper allows players of games such as card games such as 5 Crowns, Gin, Rummy, Phase 10, Rage, dice games such as Farkle, Sushi Go and Yahtzee, dominos games such as Train or Chickenfoot and more to easily keep track of their scores while playing instead of reverting to pencil and paper!
You can add and subtract scores and there is also an undo option.