21 Sharp
Master Blackjack Strategy
About
Master blackjack strategy and card counting with this professional-grade trainer. Learn optimal plays, practice counting systems, and track your progress with realistic simulations and reference guides. Reduce the house edge and gain a competitive advantage.
What's New in 21 Sharp
1.0
February 12, 2026
In-App Purchases
$2.99
21 Sharp Premium
Unlock all premium features forever.
Developer apps
FAQ
What is 21 Sharp?
21 Sharp is a professional-grade blackjack trainer designed to teach users basic strategy and card counting techniques. It aims to help players reduce the house edge and improve their game.
Does 21 Sharp have ads?
No, 21 Sharp does not contain advertisements. The app is free to download and use, with optional in-app purchases available for enhanced features or content.
What learning methods does 21 Sharp use?
21 Sharp employs a quiz system for basic strategy, drilling over 270 hand combinations. It also offers speed-building exercises for card counting and realistic practice hands with real-time hints.
Can I track my progress in 21 Sharp?
Yes, 21 Sharp allows you to track your progress by unlocking over 25 achievements. You can monitor your accuracy, streaks, and statistics across all training modes.
What card counting system does 21 Sharp teach?
21 Sharp focuses on teaching the Hi-Lo counting system. It includes exercises to master tracking running counts, calculating true counts, and learning when to adjust bets.
What devices is 21 Sharp available on?
21 Sharp is available on iPhone and iPad devices. It is designed for mobile use, allowing practice anytime, anywhere.
How often is 21 Sharp updated?
The latest version of 21 Sharp is 1.0, and it was last updated on February 12, 2026. As a newer application, future updates will likely focus on adding new features and refining existing ones.
What is the age rating for 21 Sharp?
21 Sharp has an age rating of 12+. This indicates it is suitable for users aged 12 and older, considering its educational content related to card games.
