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!
Free
In-App Purchases
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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+1
What's New in The Mahj Index
1.1
August 12, 2026
Play at a higher level with 1.1.0: - Scrimmage: play a full game against three bots, from the first Charleston to the final discard. - New members: everything is unlocked free for your first 7 days. No credit card, no strings. - The Learn module now links straight into practice: drill what you just learned. - Sharper stats, smoother streaks, and fixes throughout.
MoreSubscription plans
TMI Premium Monthly
Full stats, daily drills, complete history
$4.991 Month
7 Days trialUser reviews
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.