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The Mahj Index: Mahjong Coach

The Mahj Index: Mahjong Coach

Play American Mah Jongg

64 ratings
4 reviews
🎮 Games
📚 Education
🎲 Board
Free
In-App Purchases

Details

Released
August 5, 2026
Updated
October 28, 2026

Features

Developer

The Mahj Index
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The Mahj Index: Mahjong Coach screenshot #1 for iPhone
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About

Practice American Mahjong with interactive drills and track your game performance. Log matches to get a TMI Rating and understand your playing style. Connect with friends to host games and build a shared history.

✓Interactive Mahjong drills
✓Game logging and scoring
✓AI-powered player rating (Glicko-2)
✓Performance analytics
✓Friend invitations and game hosting
✓National Mah Jongg League card support
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What's New in The Mahj Index

1.2.0

October 28, 2026

Pass your rack, the Sunday Social, and see the whole board. * Play My Rack: after any bot game, send a friend the exact hand you just played. Same deal, same bots, their decisions. Everyone who plays it lands on that hand's leaderboard. * Sunday Social: every Sunday, everyone on the app gets the same 2 hands against the same bots. Results and leaderboards arrive Monday. Free for all members. * See the Board: after a bot game, review the final table, every exposure, and the line you were closest to. * Bot games can now count toward your TMI Rating. Seasoned and Advanced games are rated if you choose. * Smarter bots: recalibrated difficulty. * Novice Guided mode tells you why a line just went dead. * Redesigned Stats and Settings, Bot History, a new Home Tour, and Mahj Personas that now include your bot games. * Standard improvements and bug fixes.

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Subscriptions & In-App Purchases

TMI Premium Monthly

Full stats, daily drills, complete history

$4.991 Month
How to cancel The Mahj Index subscription ⁉️

User reviews

Most RecentHighest RatedLowest Rated

Great App

This is a great app for learning and for playing. The best that I’ve found, but it could be improved by changing the background color and tiles. The light background doesn’t contrast the tiles making it difficult to read the tiles. I love the option to add blanks and create games with friends as well as the ability to practice the Charleston.
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TTraceyNec

Finally stopped feeling rushed at the table!

I’ve been intimidated by Mahj because I’d get overwhelmed trying to pick a line while everyone else seemed to know what they were doing. The Mahj Index is exactly what I needed! The drills let you get reps identifying which line to go for, over and over, without the pressure of a live game - and the coaching tips explain the why, not just the answer. I’m spotting lines way faster now and actually enjoying the game instead of a feeling stressed. If you’re a newer player or someone who wants to improve quickly, this is the app! I love it
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LLagotto22

Easy and fun!

Thorough with lots of helpful information, easy to use and understand. So much fun!
MFMahj Fan

Modern, intuitive, beautiful - just like the game

Such an easy and intuitive app to practice and learn mahjong. Have been looking for an app like this for soooo long. Finally something that feels modern and useful!
SSpottedatbrunch

FAQ

What is The Mahj Index?

The Mahj Index is a mobile application designed to help American Mahjong players practice, track their games, and improve their skills. It offers interactive drills and a performance rating system to analyze gameplay.

Does The Mahj Index have ads?

No, The Mahj Index does not contain advertisements. The app is free to join with optional premium features available through subscription.

How does The Mahj Index calculate player ratings?

The Mahj Index uses the Glicko-2 rating system, a method trusted in competitive gaming, to calculate a player's TMI Rating. This rating is based on game performance and is verified by other players at the table for accuracy.

What are the subscription options for The Mahj Index?

TMI Premium offers two subscription plans: a monthly plan for $4.99 and an annual plan for $49.99. Both plans include a 7-day free trial. Premium unlocks the full practice library, advanced analytics, and complete game history.

What devices does The Mahj Index support?

The Mahj Index is currently supported on iPhone and iPod devices. It is designed for users who want to practice and track their Mahjong games on the go.

How often is The Mahj Index updated?

The Mahj Index was last updated on August 12, 2026, with version 1.1. The app is built for American Mahjong using the current National Mah Jongg League card, which is updated annually.

What is the age rating for The Mahj Index?

The Mahj Index has an age rating of 17+. This rating is typically assigned to apps that may contain content not suitable for younger users, though specific reasons are not detailed in the provided data.

Can I play The Mahj Index offline?

The provided description focuses on practice drills and game logging, which may require an internet connection for certain features like hosting games or syncing ratings. Specific offline capabilities are not detailed.