# Riichi Mahjong Calculator (open-source utility app)

> 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.

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.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/ssttkkl/mahjong-utils-app |
| Platforms | Android, iOS, Web, Desktop |
| Built with | Kotlin Multiplatform |
| GitHub stars | 118 |
| License | MIT (open source) |
| F-Droid | https://f-droid.org/packages/io.ssttkkl.mahjongutils.app/ (package io.ssttkkl.mahjongutils.app) |
| F-Droid anti-features | none flagged |
| Google Play | not linked |
| App Store | not linked |
| Website | https://ssttkkl.github.io/mahjong-utils-app/ |
| Official | no |
| Category | Utilities |
| Latest release | v1.1.4 (Oct 28, 2026) |
| Last commit | Oct 28, 2026 |

F-Droid builds its apps from source and flags anti-features: https://f-droid.org/en/docs/Anti-Features/

## Similar mobile apps

- [Phylax](https://appsgit.com/mobile-apps/phylax): Viewer for Frigate NVR with smart URL switching and notifications. (120 stars, MIT)
- [RecorderX](https://appsgit.com/mobile-apps/recorderx): RecorderX is an application designed for high-fidelity screen capture. (117 stars, Apache-2.0)
- [Android 2 Linux Notifications](https://appsgit.com/mobile-apps/android-2-linux-notifications): A way to display Android phone notifications on Linux. (120 stars, GPL-3.0-only)
- [Bubble Notice](https://appsgit.com/mobile-apps/bubble-notice): A lightweight bubble notice tool, providing more intuitive notifications for the. (116 stars, GPL-3.0-or-later)
- [Loophole](https://appsgit.com/mobile-apps/loophole): One-tap Quick Settings toggle for Android Developer Options. (122 stars, MIT)
- [Supertonic TTS](https://appsgit.com/mobile-apps/supertonic-tts): Local AI Text-to-Speech using Supertonic ONNX. (111 stars, GPL-3.0-only)

---

Canonical page: https://appsgit.com/mobile-apps/riichi-mahjong-calculator
Source: appsgit (https://appsgit.com), the app store for github. Data from the GitHub API, refreshed daily.
Machine access: JSON API https://appsgit.com/api/v1/apps (OpenAPI: https://appsgit.com/openapi.json), MCP server https://mcp.appsgit.com/mcp, full index https://appsgit.com/llms-full.txt.