Blackjack Strategy: 21 Trainer
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About this game
Stop guessing. Start playing perfect blackjack.
21 Trainer tells you the mathematically correct play for every hand, and explains WHY, so you walk into any casino with confidence, not hope.
Whether you're learning basic strategy for the first time or drilling advanced card counting deviations, 21 Trainer adapts to your level.
▸ LEARN THE RIGHT PLAY (FREE)
• 270+ hand scenarios with instant right/wrong feedback and clear explanations for every decision
• Color-coded strategy charts that adjust automatically to your selected house rules
• 9 real casino presets: Vegas Strip, Downtown Vegas, Atlantic City, Macau, Monte Carlo, Sydney, European (ENHC), Single Deck, and Double Deck
• Full rule customization: decks (1-8), H17/S17, DAS, early/late surrender, split limits, 3:2 or 6:5 payout
• Track accuracy, streaks, and set session goals
▸ GO PRO: MASTER THE EDGE
• 4 Card Counting Systems: Hi-Lo, KO, Omega II, and Zen Count
- Single Card Drill: lock in point values
- Multi-Card Counting: build speed under pressure
- Deviation Trainer: learn when the count overrides basic strategy
• Bankroll Simulator: run virtual sessions with real bet sizing, then review your ROI, strategy adherence, and a hand-by-hand mistake breakdown
• Hard Mode: finds your weakest hands and drills them until they're strengths
• Advanced Statistics: accuracy heat maps by hand type and dealer upcard, session history, and progress tracking
▸ BUILT FOR SERIOUS PLAYERS
• Works 100% offline, practice anywhere
• Left and right-handed layouts
• Blind Mode: hide totals, read the cards like a pro
• 4 felt colors, 5 card back designs, haptic feedback
• Auto-deal with adjustable speed
No real money. No gambling. No data collected. Just pure strategy training for players who refuse to leave money on the table.
Privacy Policy: https://21trainer.app/privacy
Terms of Use: https://21trainer.app/terms
Support: https://21trainer.app/support
21 Trainer tells you the mathematically correct play for every hand, and explains WHY, so you walk into any casino with confidence, not hope.
Whether you're learning basic strategy for the first time or drilling advanced card counting deviations, 21 Trainer adapts to your level.
▸ LEARN THE RIGHT PLAY (FREE)
• 270+ hand scenarios with instant right/wrong feedback and clear explanations for every decision
• Color-coded strategy charts that adjust automatically to your selected house rules
• 9 real casino presets: Vegas Strip, Downtown Vegas, Atlantic City, Macau, Monte Carlo, Sydney, European (ENHC), Single Deck, and Double Deck
• Full rule customization: decks (1-8), H17/S17, DAS, early/late surrender, split limits, 3:2 or 6:5 payout
• Track accuracy, streaks, and set session goals
▸ GO PRO: MASTER THE EDGE
• 4 Card Counting Systems: Hi-Lo, KO, Omega II, and Zen Count
- Single Card Drill: lock in point values
- Multi-Card Counting: build speed under pressure
- Deviation Trainer: learn when the count overrides basic strategy
• Bankroll Simulator: run virtual sessions with real bet sizing, then review your ROI, strategy adherence, and a hand-by-hand mistake breakdown
• Hard Mode: finds your weakest hands and drills them until they're strengths
• Advanced Statistics: accuracy heat maps by hand type and dealer upcard, session history, and progress tracking
▸ BUILT FOR SERIOUS PLAYERS
• Works 100% offline, practice anywhere
• Left and right-handed layouts
• Blind Mode: hide totals, read the cards like a pro
• 4 felt colors, 5 card back designs, haptic feedback
• Auto-deal with adjustable speed
No real money. No gambling. No data collected. Just pure strategy training for players who refuse to leave money on the table.
Privacy Policy: https://21trainer.app/privacy
Terms of Use: https://21trainer.app/terms
Support: https://21trainer.app/support
Card Counting Practice & Coach
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Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
- No data shared with third partiesLearn more about how developers declare sharing
- This app may collect these data typesApp activity and Device or other IDs
- Data is encrypted in transit
- Data can’t be deleted
What’s new
Blackjack Strategy 21 Trainer is now on Android!
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About the developer
APPHAZE LIMITED
helloapphaze@gmail.com
Rm 2A 17/F GLENEALY TWR
1 GLENEALY
中環
香港島
Hong Kong
+1 672-667-8313
