Blackjack 21: Play & Master

Play blackjack your way, master basic strategy, and sharpen card counting with focused drills. No ads, no account required, and one optional lifetime Pro unlock.

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, performance, and strategy accuracy • Switch between light and dark themes

LEARN BASIC STRATEGY • Use strategy charts matched to your selected rules • Drill hard totals, soft totals, pairs, or mixed hands • Get immediate feedback with concise probability-based explanations • Learn eight card-counting systems and practical bankroll fundamentals

GO FURTHER WITH PRO One optional lifetime Pro purchase unlocks: • Live running and true counts for all eight counting systems • Count-aware insurance, bet-sizing, and index-deviation guidance • 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 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.