American mahjong
At a real table
American mahjong tools to use beside real tiles: score a game, follow the Charleston, explore a rack and check a hand.
Score a game
Keep four names, hand scores, running totals and a points-only wall-game pot.
Charleston guide
Follow each pass in turn, with an optional timer.
What can I make?
Type or tap your 13 tiles and see the three nearest hands for the supported edition.
Check a hand
Check a Mahjong, or test entered exposures for a dead hand against the supported edition.
Bring your own card
Keep your printed NMJL card beside you. No upload or full card viewer.
Which card do the tools use?
Rack suggestions and hand checks use the supported NMJL edition shown in the tool. Keep your own printed card beside you. Bring your own card does not upload a card, add custom patterns or show the full card.
Can I use the tools without signal?
Open each tool online before you need it without signal. Offline use depends on this browser keeping the app’s files.
Open and try the tools you need before game night. Offline use requires a browser that supports the app’s offline storage; clearing that storage can remove the saved files. Planning a night, finding a group and loading printables need a connection.
Where are my scores saved?
Score sheets and the Charleston timer setting are saved in this browser when storage is available. Clearing browser data can remove them. A score sheet linked to a weekly table also adds its saved hands and edits to that table’s history when online.
How do I open the tools?
These tools open in the JONGG web app and need JavaScript. We have not verified every device or browser version; try the tool on the device you plan to bring to the table.