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Frequently Asked Questions
How do I restore my purchases?
Open the app, go to the Premium section, and tap "Restore Purchases". This will restore any previous purchases associated with your Apple ID.
How do I cancel my subscription?
Subscriptions are managed through your Apple ID. Go to Settings > Your Name > Subscriptions on your device, find 21 Sharp, and tap Cancel Subscription.
Is card counting illegal?
No, card counting is not illegal. It's a mathematical strategy that skilled players use to gain an edge. However, casinos may ask you to leave if they suspect you're counting cards, as they have the right to refuse service.
What is basic strategy?
Basic strategy is the mathematically optimal way to play every possible blackjack hand. By following basic strategy perfectly, you can reduce the house edge to about 0.5%.
What counting system does the app teach?
The app primarily teaches the Hi-Lo counting system, the most popular and widely-used method. It also includes other systems like KO, Hi-Opt I, Hi-Opt II, and Omega II for advanced users.
My progress was lost. Can I recover it?
Unfortunately, progress is stored locally on your device and is not backed up to iCloud. If you uninstall the app, progress cannot be recovered. We recommend keeping the app installed to preserve your achievements.
The app is crashing. What should I do?
Try the following: 1) Make sure you have the latest version from the App Store. 2) Restart your device. 3) If the problem persists, please report the issue on GitHub with details about your device and iOS version.
Response Time
We aim to respond to all support requests within 48 hours. For urgent issues, please include "URGENT" in your message subject.