21 Coach: Blackjack Strategy

21 Coach trains you to play perfect blackjack basic strategy — the mathematically optimal decision for every hand.

This is a training tool, not a gambling app. There is no real money, no wagering, no simulated currency, and no in-app purchases.

HOW IT WORKS You are dealt a hand against the dealer's up-card. Pick your action — Hit, Stand, Double, Split, Surrender or Insurance. If you're right, the hand plays out and a new one is dealt. If you're wrong, that button greys out and you try again, with a plain-language explanation of why the correct play is correct. You learn the reasoning, not just the answer.

BUILT FOR YOUR TABLE Most trainers assume one fixed rule set. 21 Coach adapts to the table you actually play: • 1 to 8 decks • Dealer stands or hits soft 17 (S17 / H17) • Double on any, 9-11, 10-11, or never • Double after split (DAS) on or off • Surrender: never, late, early, or early except vs Ace • Dealer peek (US) or no peek (European) • Blackjack pays 3:2 or 6:5

Change any rule and the strategy card recalculates instantly — training and reference can never disagree.

ONE-TAP PRESETS Vegas Strip, Vegas Downtown, Typical European, or your own custom table.

FOCUSED PRACTICE • Modes: All hands, Soft hands, Pairs, or Custom • Custom mode: pick exactly which hands and which dealer up-cards to drill • Skill levels: Normal deals at random; Beginner, Intermediate and Advanced weight toward the tricky hands where basic strategy is easiest to get wrong

TRACK YOUR WEAK SPOTS Hands played, guesses, errors, accuracy and streaks. A Frequent Errors list ranks the exact hands you get wrong most often — then drill just those in Custom mode.

LIVE STRATEGY CARD Colour-coded hard, soft and pairs charts with your current hand highlighted. Full legend included.

BUILT-IN GUIDE A Help section explains how blackjack works, what each action does, and what every house rule means for your odds.

ALSO • English and Turkish • Works completely offline • No ads, no accounts, no tracking, no data collection • Your stats and settings stay on your device

Whether you're preparing for a casino trip or just want to stop guessing at the table, 21 Coach gets you to perfect basic strategy.