Protocol 21 for Android
Download the #1 blackjack card counting trainer for Android. Master Hi-Lo, KO, Omega II, and other counting systems with casino-grade training drills. Free for all Android devices.
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Full Access
Android-Optimized Features
Universal Device Support
Works seamlessly on all Android phones and tablets. Optimized for devices from budget-friendly to premium flagship models.
Native Android Controls
Full support for Android touch gestures, back buttons, and system navigation. Familiar Android interaction patterns throughout the app.
Battery Optimization
Efficient battery usage with smart power management. Train for hours without excessive battery drain.
Dark Theme Support
Full Material You dark theme support on Android 12+. Custom theme colors match your system preferences.
Accessibility Features
TalkBack support, adjustable text sizes, color contrast options, and full accessibility compliance for all users.
Android Security
Uses Android's latest security features. Google Play Protect verified and regularly scanned for security.
System Requirements
How to Download & Install
Open Google Play Store
Launch the Google Play Store app on your Android device.
Search for Protocol 21
Use the search feature to find "Protocol 21 Blackjack Counter".
Tap Install
Tap the "Install" button to begin downloading the app.
Accept Permissions
Review and accept app permissions. Protocol 21 only requests necessary permissions for functionality.
Launch & Begin Training
Once installation completes, tap "Open" to start Protocol 21 and begin card counting training.
Device Compatibility
Protocol 21 works on a wide range of Android devices, from budget smartphones to high-end tablets.
Works Great On:
- ✓ Samsung Galaxy phones & tablets
- ✓ Google Pixel phones
- ✓ OnePlus devices
- ✓ Motorola Android phones
- ✓ LG Android devices
- ✓ All other Android devices
Features Optimized For:
- ✓ Small phone screens (4-5 inches)
- ✓ Standard phones (6-6.5 inches)
- ✓ Large phones (6.5+ inches)
- ✓ Tablets (7-13 inches)
- ✓ Foldable devices
- ✓ All screen densities & ratios
What You Get
Guided Learning
- ✓ Phase 0: Basic Strategy
- ✓ Phase 1: Card Values
- ✓ Phase 2: Running Count
- ✓ Phase 3: True Count
- ✓ Phase 4: Bet Sizing
- ✓ Phase 5: Deviations
Training Drills
- ✓ True Count Conversion
- ✓ Speed Counting
- ✓ Deck Estimation
- ✓ Casino Simulation
- ✓ Progressive Difficulty
- ✓ Detailed Analytics
Ready to Start Training?
Download Protocol 21 free on Android today. Master blackjack card counting with the #1 trainer app for smartphones and tablets.