This app lets you quickly enter Riichi Mahjong hands for calculation. Choose which player you are, how you won, bonus rounds, dora, and so on, and it gives you back your score right away! Detects special and unusual hands, with standardized terminology, using standard Japanese scoring, just like in your favorite online Mahjong games!

Undo functionality for mistakes, screenshot ability, as well as a "What would you Cut" (nani kiru) screenshot for incomplete hands so you can post it online for your friends.