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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.

Protocol 21 blackjack card counting app

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.

Protocol 21 card shoe simulation
True count training in Protocol 21
Skill progression in Protocol 21

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.