Download Protocol 21
The most advanced blackjack card counting trainer for iOS and Android. Train like a pro. Play with an edge.
Requires iOS 15+ or Android 10+. Free with optional Pro upgrade.
Everything You Need to Win
Protocol 21 isn't just another blackjack game. It's a complete training system designed to build the skills you need for real advantage play.
6 Counting Systems
Hi-Lo, KO, Omega II, Zen Count, Red 7, and Wong Halves
True Count Drills
Master the mental math with instant feedback
Speed Training
Practice at casino speeds and beyond
Deck Estimation
Train visual accuracy for true count conversion
Casino Simulation
Background noise, distractions, and pressure
Progress Tracking
Track accuracy and speed over time
See It In Action
Casino-grade training with professional-level feedback and analytics.
Frequently Asked Questions
Common questions about Protocol 21 and card counting.
Is Protocol 21 really free?
Yes! Protocol 21 is free to download with core features including Hi-Lo training, basic drills, and shoe simulation. Pro features like advanced systems (Omega II, Wong Halves) and detailed analytics require a subscription.
Which platforms does Protocol 21 support?
Protocol 21 is available for iOS (iPhone and iPad) and Android devices. We're also working on a web version for desktop practice.
Can I learn card counting from scratch with this app?
Absolutely. Protocol 21 includes tutorials for beginners starting with Hi-Lo, the most popular and accessible counting system. Our progressive drill system takes you from basics to casino-ready.
Is card counting legal?
Yes, card counting is completely legal. It's a mental skill that uses probability and memory. However, casinos are private businesses and may ask skilled counters to leave. Protocol 21 is a training tool for educational purposes.
How long does it take to learn card counting?
With consistent practice using Protocol 21, most users develop basic Hi-Lo proficiency in 2-4 weeks. Casino-ready speed and accuracy typically takes 2-3 months of daily practice.
Your Edge Starts Now
Stop gambling. Start playing with a mathematical advantage. Download Protocol 21 free today.