21 Card Counter

21 Card Counter is a blackjack card counting trainer built for players who want to sharpen their Hi-Lo skills.

REAL-TIME STRATEGY GUIDANCE
Enter your cards and the dealer's upcard to get instant basic strategy recommendations. The app tells you exactly when to Hit, Stand, Double, Split, or Surrender. No guesswork.

ILLUSTRIOUS 18 DEVIATIONS
Go beyond basic strategy. 21 Card Counter incorporates the Illustrious 18 deviation system, automatically adjusting recommendations based on the true count. Know exactly when the count changes your play.

HI-LO COUNTING SYSTEM
Track your running count and true count across 1, 2, 4, 6, or 8 decks. Tap Hi or Lo as cards are dealt and watch the true count update instantly.

MULTI-CARD HAND SUPPORT
Hit multiple times and the app tracks your full hand total, handling soft and hard hands automatically.

CLEAN AND DISTRACTION FREE
Designed for focus. Dark interface, large buttons, instant feedback. Everything you need, nothing you don't.

FOR TRAINING PURPOSES ONLY
This app is intended for educational and personal practice only. Use of card counting strategies in casinos may violate their rules and policies.

FEATURES
Hi-Lo running count and true count tracking. Supports 1, 2, 4, 6, and 8 decks with swipe selector. S17 basic strategy engine with Illustrious 18 and Fab 4 deviations. Soft hand detection. Multi-card hand support. Insurance reminder. No ads, no accounts, no internet required.