Back to Home

Card Counting Blog

Strategies, tips, and training guides from the Protocol 21 team. Master the edge.

Fundamentals2026-01-288 min read

How Does Card Counting Work in Blackjack?

Learn the fundamentals of card counting in blackjack. Understand how advantage players track cards to gain an edge over the casino.

Read Article
Systems2026-01-2512 min read

Hi-Lo Card Counting System: Complete Guide for Beginners

Master the Hi-Lo card counting system with our comprehensive guide. Perfect for beginners looking to learn the most popular counting method.

Read Article
Reviews2026-01-206 min read

Best Card Counting Apps for Practice in 2026

Discover the top card counting trainer apps for iOS and Android. Compare features and find the best app to sharpen your blackjack skills.

Read Article
Guide2026-01-2815 min read

The Ultimate Guide to Blackjack Card Counting Apps (2026 Edition)

The definitive guide to choosing the best card counting app. We review the top trainers, simulators, and free tools to help you beat the house.

Read Article
Systems2026-01-285 min read

Hi-Lo Card Counting App | Protocol 21 Blackjack Trainer

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.

Read Article
Systems2026-01-285 min read

KO (Knock-Out) Blackjack System App & Trainer

Learn the Knock-Out (KO) system without the math. Protocol 21 is the best app for unbalanced counting systems on mobile.

Read Article
Systems2026-01-286 min read

Omega II Card Counting Trainer | Advanced Blackjack App

Practice the complex Omega II system with Protocol 21. Our advanced mode supports Level 2 values and Ace side-counts.

Read Article
Systems2026-01-286 min read

Zen Count Blackjack Trainer App

The Zen Count requires precision. Use Protocol 21's custom drills to master this powerful Level 2 balanced system.

Read Article
Systems2026-01-285 min read

Red 7 Card Counting App | Learn Unbalanced Counting

Learn Arnold Snyder's Red 7 system. Protocol 21 helps you practice the color-dependent starting counts unique to this system.

Read Article
Systems2026-01-287 min read

Wong Halves Blackjack Trainer | Expert Counting App

Wong Halves is the hardest system to master. Protocol 21 is the only app that supports fractional values for expert drills.

Read Article
Drills2026-01-284 min read

Blackjack True Count Trainer App

Master mental math with Protocol 21. Learn to divide the running count by decks remaining instantly.

Read Article
Drills2026-01-284 min read

Deck Penetration & Estimation Drills

Improve your visual accuracy. Learn to guess how many decks are in the discard tray with precision.

Read Article
Drills2026-01-284 min read

Card Counting Speed Simulator

Increase your reaction time. Don't lose the count when the dealer speeds up.

Read Article