Blindfold Chess Trainer

I've been trying to learn blindfold chess and this app has been both insanely helpful and effective. And I personally don't think the price for the subscription is bad at all. I seriously hate subscription models and would prefer a one time purchase, but compared to other app subscriptions, the rates are very reasonable. The only thing I wish would be fixed is the "hands free" when playing a vocal game. When doing so, the app doesn't disable the phone from auto locking and sleeping, so unless you turn it off in iOS settings, you have to keep tapping the screen when it turns dim, so it's not really hands free. Overall this app is awesome and I'm glad I gave it a try