Riichi Mahjong Calculator
Riichi Mahjong Calculator is a free, open-source utility app for Android and iOS. Riichi Mahjong Calculator, featuring hand efficiency calculation, and more. It has 118 GitHub stars and is released under the MIT license, and you can install it from F-Droid.
github.com/ssttkkl/mahjong-utils-app (opens in a new tab)
Data as of from the GitHub API and the F-Droid index; description from the project's repository or F-Droid listing. Report an error
About Riichi Mahjong Calculator
Riichi Mahjong Calculator, supporting features such as hand efficiency, meld hand efficiency, winning hand analysis, and score calculation for fan and minipoints. - Hand Efficiency: Includes tile efficiency, good-shape tile efficiency (for one-shanten only), and backwards strategy. - Meld Hand Efficiency: Tile efficiency for chow, pung, kong, and pass; includes good-shape tile efficiency (for one-shanten only) and backwards strategy. - Winning Hand Analysis: Defaults to Mahjong Soul/Tenhou rules, with customizable rules to some extent. - Score Calculation By Fan and Minipoints: Defaults to Mahjong Soul/Tenhou rules, with customizable rules to some extent.
Privacy and F-Droid
F-Droid builds Riichi Mahjong Calculator from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.
No anti-features flagged on the latest F-Droid build.
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Is Riichi Mahjong Calculator free and open source?
Yes. Riichi Mahjong Calculator's source code is public on GitHub under the MIT license, which is OSI-approved or FSF-free. F-Droid, which builds it from source, flags no anti-features such as ads or tracking on its latest build.
How do I install Riichi Mahjong Calculator?
You can install Riichi Mahjong Calculator from F-Droid (package io.ssttkkl.mahjongutils.app); the links are on this page. Its GitHub repository also publishes releases (latest: v1.1.4).
Is Riichi Mahjong Calculator still maintained?
The repository's most recent commit was on Oct 28, 2026. Its F-Droid listing was last updated on Aug 7, 2025. appsgit only lists apps whose repository had a commit in the last six months.