Is this the National Mah Jongg League's app?

No. This is independent and not affiliated with the League. You keep using their card; you type the hands you want to practise into the app yourself.

American Mah Jongg, the game played with the yearly card, Jokers and the Charleston. Not Chinese, Japanese or Hong Kong mahjong, and not the tile-matching solitaire game.

Do I need to download anything?

No. It opens in the browser on your phone, tablet or computer. You can add it to your home screen if you like.

Dylan, an independent developer, building it in the open with early learners.

The free drills are open now. The full app, with your own card, comes next, and founding members get it first.

Tile & Error · an independent practice app for American Mah Jongg

Practice American Mah Jongg at your own pace.

Big tiles. No timer. Works with the card you already own. And it tells you why a pass or a discard is the right one, so the game starts to make sense.

Practice at home, so you feel ready at your next game.

Reserve your spot for $19 a year

Founding price, first 100 learners. One payment, nothing renews by itself, and your year starts the day the app opens. Full refund any time before then.

Or try the free drills first

Not ready to pay? Leave your email instead.

The Charleston drill, as it runs today.

Made for the first few months after your class

You took the lessons. You bought the card. Then the first open-play night came and the table moved faster than you could read. That is normal, and it is exactly the stretch this app is for.

Tile recognition drills until Bams, Craks, Dots, Winds, Dragons and Jokers are instant.
Charleston practice: you get thirteen tiles, you pick three to pass, and the app explains why those three.
Hand reading: which hands on your card fit the tiles in front of you, ranked, with the reason. A first version is free now.
Calling and Joker rules, the ones everyone gets wrong at first, as short quizzes.

Built around complaints we read in 1,900 app reviews

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Tiles you can actually see. Large by default. No squinting, no magnifying glass.
No clock. Think as long as you like. Nothing times out.
Your card, not ours. You enter the hands from the card you own. We never copy the League's card, and we never ask you to buy it again inside the app.
One price, no monthly fees. $19 for your first year, no paywalls inside, no ads, ever.
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Phone, tablet or computer. It runs in your browser. Nothing to install, nothing to update.

Two ways to be part of it

$19 for your first year, founding price

Reserve a spot now and you get the app the day it opens, plus a say in what we build first. One payment: nothing renews by itself, and your year starts on opening day, not today. Full refund any time before launch, no questions.

Reserve my spot for $19

Not ready to pay? Leave your email. You'll hear from me when the full app opens, plus the odd short note asking what would help you most. Never spam, and one reply stops it. The free drills are open now.

Questions people ask

Is this the National Mah Jongg League's app?: No. This is independent and not affiliated with the League. You keep using their card; you type the hands you want to practise into the app yourself.
Which rules?: American Mah Jongg, the game played with the yearly card, Jokers and the Charleston. Not Chinese, Japanese or Hong Kong mahjong, and not the tile-matching solitaire game.
Do I need to download anything?: No. It opens in the browser on your phone, tablet or computer. You can add it to your home screen if you like.
Who is making it?: Dylan, an independent developer, building it in the open with early learners.
When does it open?: The free drills are open now. The full app, with your own card, comes next, and founding members get it first.