Blackjack 21: Play & Master

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.