Blackjack Trainer: TwentyOne
Card Counting & Hi-Lo Practice
Only for iPhone
Free · In‑App Purchases
iPhone
TwentyOne: Blackjack Trainer is a blackjack training app focused on helping players build faster, more accurate decision-making through realistic practice drills, structured training modes, and performance tracking. Whether you're learning basic strategy for the first time or refining years of instinctive play, TwentyOne is designed to help you practice with purpose and improve through repetition.
PRACTICE WITH PURPOSE
Train with realistic blackjack hands and customizable rules that let you focus on the situations where you need the most improvement. Every decision includes instant feedback so you can quickly learn from mistakes and reinforce correct play.
Configurable rules: H17/S17, Double After Split, Surrender
Focused practice drills for hard totals, soft totals, pairs, doubles, and surrenders
Immediate feedback showing the correct play and explanation behind it
Fast-paced training designed for repetition and muscle memory
Also includes card counting practice modes built around the Hi-Lo system. Train instant card recognition with Flash Drill, maintain accurate running counts through timed card sequences, or push your limits in Ramp Mode where the speed and difficulty continuously increase.
LEARN THE RIGHT PLAY
Supplement your practice with structured lessons that explain the reasoning and math behind each decision. Lessons are designed to reinforce understanding alongside repetition-based training.
6 modules / 40+ lessons covering fundamentals, hard hands, soft hands, pairs, advanced concepts, and more
Interactive examples with instant feedback and explanations
Module quizzes and strategy chart highlights to reinforce learning
TRACK YOUR PROGRESS
Detailed analytics help you identify weak areas and measure improvement over time.
Accuracy trends over 7 days, 30 days, or all time
Category breakdowns: hard totals, soft totals, pairs, doubles, surrenders
Session history with hands played, accuracy, and mistake summaries
Achievement badges for milestones and streaks
REFERENCE ANYTIME
Access the full basic strategy chart whenever you need it — during lessons, practice sessions, or standalone review.
Color-coded strategy chart for your configured rules
Tap any chart cell for an explanation of the recommended play
Glossary of key blackjack terms
IMPORTANT: This app is an educational tool only. It does not involve real money and does not guarantee results. Basic strategy reduces the house edge but does not eliminate it.
Free to start. Module 1 is included at no cost. Unlock decision practice, the full curriculum and advanced stats with Premium.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
We continue to deliver new and exciting ways to learn Blackjack
The developer, Ryan Herga, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Ryan Herga
- Size
- 37 MB
- Category
- Card
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later.
- iPhone
- Languages
- English
- Age Rating
18+
- 18+
- In-App Purchases
Yes
- Lifetime Premium $19.99
- Annual Premium $9.99
- Monthly Premium $1.99
- Copyright
- © 2026 Ryan Herga