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Coins are cosmetic. They never change your odds or your score. Any coin also turns ads off. Bought on another device? Email us your player code and the email you paid with, and we'll move your purchases over.
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Upload a picture for each side. We'll crop them into circles and stamp them into your coin.
Skip the back and we'll use your front on both sides. The front shows on the board and your share card.
Others see your coin after a quick review. Keep it friendly: no logos you don't own, nothing offensive.
Test mode. No card is charged. On the live site this button opens secure checkout.
Cosmetic only: never changes your odds or score. Paid securely with Stripe. See refunds.
Send this link to a friend or a group chat. Everyone plays a fresh game of with their own flips. Scores stay hidden until each player finishes. Best stack wins.
In 1956, John Kelly worked out the bet size that grows money fastest. With a 60/40 coin it's 20% of your stack every flip. Bet more and you go broke more often. Bet less and you grow too slowly.
The Kelly bot plays your exact flips using that formula, so at the end you can see whether you beat the math.