Double Down: Blackjack Trainer

See the expected value behind every hit, stand, double, and split. The blackjack basic-strategy trainer that shows its work — educational, ad-free, beautifully built.

Double Down is the blackjack trainer that shows its work.

Most apps just tell you the "correct" move. Double Down teaches you the math behind it — the expected value (EV) of every decision — so you stop memorizing a chart and start genuinely understanding the game.

It's an educational trainer and simulator. No real money, no wagering, no casino. Just you, real hands, and the numbers. No Double Down account required; optional iCloud sync and Game Center achievements use your Apple account.

HOW IT WORKS • Deal a real hand and choose your play — hit, stand, double, split, or surrender. • Get instant feedback on whether it was the EV-optimal decision. • Tap to see exactly why.

SEE THE MATH Every hand opens into a clear, honest breakdown: • Expected value of each action, side by side • Win / push / loss probabilities • Your bust risk if you hit • The dealer's full distribution of final totals

TRAIN FOR YOUR EXACT TABLE Basic strategy changes with the rules — so configure them all: • 1–8 decks • Dealer hits or stands on soft 17 (H17 / S17) • 3:2 vs 6:5 blackjack payouts • Late, early, or no surrender • Double after split, resplits, hit split aces • Even the Free Bet variant

TRACK YOUR PROGRESS • Accuracy, streaks, and decisions over time • Performance broken down by situation • Your recent mistakes, so you always know what to drill next

LEARN THE CONCEPTS Ten focused lessons on the probability and expected value beneath basic strategy — hard totals, soft totals, pairs, doubling, surrender, and how each rule change moves the math.

DESIGNED TO FOCUS A quiet, premium, ad-free experience with a beautiful Day and Night theme. Practice works locally; optional iCloud sync and Game Center achievements use Apple's services when enabled.

Double Down is an educational tool for learning optimal blackjack strategy and the expected-value math behind it. It is not a gambling product: there is no real-money play and no wagering.