Master the Count.
Beat the House.
Protocol 21 is the only card counting trainer built for serious advantage players. Casino-grade drills. Six proven systems. Your edge starts here.
Supported Systems
Don't just learn to count. Master the specific nuances of your chosen system with dedicated algorithms and real-time feedback.
Hi-Lo
Master the famous Hi-Lo card counting system. Protocol 21 provides the specific +1/-1 drills you need to learn Hi-Lo for iOS and Android.
KO (Knock-Out)
Learn the Knock-Out (KO) system without the math. Protocol 21 is the best app for unbalanced counting systems on mobile.
Omega II
Practice the complex Omega II system with Protocol 21. Our advanced mode supports Level 2 values and Ace side-counts.
Zen Count
The Zen Count requires precision. Use Protocol 21's custom drills to master this powerful Level 2 balanced system.
Red 7
Learn Arnold Snyder's Red 7 system. Protocol 21 helps you practice the color-dependent starting counts unique to this system.
Wong Halves
Wong Halves is the hardest system to master. Protocol 21 is the only app that supports fractional values for expert drills.
Advanced Drills
Purpose-built exercises that target your weakest skills and transform them into strengths.
True Count Conversion
Target: Mental Math
“dividing the running count by decks remaining instantly”
Deck Estimation
Target: Visual Accuracy
“guessing how many decks are in the discard tray”
Speed Count
Target: Reaction Time
“losing the count when the dealer speeds up”
Ready to Get Your Edge?
Join thousands of advantage players who trust Protocol 21 for their training. Start your journey to consistent profits today.