Basis21 is a blackjack basic-strategy trainer for iOS and Android. If something isn't working, or you have a question or suggestion, get in touch and we'll help.
Email vincentwahkit@gmail.com and we'll get back to you as soon as we can.
Does Basis21 involve real-money gambling?
No. Basis21 is a training tool for education and entertainment only — no real-money wagering, betting, or gambling happens in the app.
Where is my data stored?
Everything — your rule profiles, drill history, and stats — stays on your device. Nothing is sent to a server. See the Privacy Policy for details.
What does Premium unlock?
A one-time purchase that removes the free-tier limits on Drill hands and Strategy Chart EV reveals. It's a single non-consumable purchase, not a subscription.
How do I restore my purchase on a new device?
Open the app, go to the Premium screen, and tap Restore Purchases while signed into the same Apple ID or Google account used for the original purchase.