Master Riichi Mahjong
Score riichi mahjong hands and learn every yaku, by the rules you play. No ads, no account, and nothing collected.
App Features
Hand Calculator
Tap tiles on a keyboard and the score follows every change, as the winner announces it. See each yaku, the fu and how the points are worked out, and who pays what at the table, with counters, riichi sticks and liability.
Three Rule Sets
EMA 2016 for European tournaments, WRC 2025 for the World Riichi Championship, or Mahjong Soul's ranked rules, each with its own red fives, rounding and yakuman. The calculator and the encyclopedia follow your choice.
Yaku Encyclopedia
All 43 yaku and yakuman, with their English and Japanese names, the rules and their place in the EMA rulebook, tips, common mistakes, and example hands that open in the calculator. A points table gives every han and fu under your rules.
Practice Arena
Drills to score a hand and to find its waits.
Support & Resources
Report Issues
Found a bug or have an idea? Email us. In the app, Send feedback in Settings does the same and adds your app version.
Contact Support