iPhone Screenshots


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.

What’s New

Version 1.01

1.01 - Various bug and crash fixes

Ratings and Reviews

4.3 out of 5
6 Ratings

6 Ratings

Magma080 ,

Pretty good app

I use this app to calculate and works pretty well. There doesn’t seem to be a way to calculate for double riichi though.

Tehwulfy ,


When calculating certain super rare hands such as 13 orphans, the app crashes and forced me to use web browser options.

Also, removing some tiles is surprisingly annoying due to the single undo method of fix g changes.

Syarristar ,

Must Have

Incredible Calculator for beginners to get the feel for what a hand is worth, or for pros to check their math. Great work!

App Privacy

The developer, Heart of the Cards, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer's privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


Anime_Cubed, Inc.
27.8 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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