Blackjack 21

Play blackjack. Learn the decisions. Train the count. Blackjack 21 combines a clean, fully playable card game with practical tools for learning basic strategy and card counting. There are no ads and no account is required. PLAY YOUR WAY • Choose 1, 2, 4, 6, or 8 decks • Set dealer soft 17, double after split, resplitting, late surrender, and shuffle depth • Practice split, double, surrender, and insurance decisions • Review hand history with every decision graded: what you played and what strategy recommends • Track your performance and strategy accuracy • Light and dark themes, plus a four-color deck for easier reading • Made for iPhone and iPad LEARN BASIC STRATEGY • Use strategy charts matched to your selected rules • Drill hard totals, soft totals, pairs, or mixed hands • Focused practice saves the hands you miss and brings them back until you get them right three times in a row • Get immediate feedback with concise probability-based explanations • Your training progress is saved between sessions • Learn eight card-counting systems (Hi-Lo, KO, Hi-Opt I and II, Omega II, Red 7, Zen Count, and Wong Halves) plus practical bankroll fundamentals GO FURTHER WITH PRO One optional lifetime Pro purchase unlocks: • Live running and true counts for all eight systems, with Show, Hide, or Quiz me modes • Strategy basis: play and grade by basic strategy or count-adjusted strategy, with index-deviation and insurance guidance • Bet suggestions from preset or custom bet ramps • Speed count, Deck countdown, Deviations, and Bet ramp drills • Bankroll calculator PRIVACY AND ACCESS • No advertising or cross-app tracking • No account or sign-in • Core gameplay and training work offline • Optional anonymous usage data helps us see which features are useful. It is on by default and you can turn it off anytime in Settings • Optional bug reports and automatic crash diagnostics help us improve reliability Blackjack 21 simulates casino card play for entertainment and training only. It does not offer real-money gambling, prizes, wagering, or cash-out.