Thieves plain and simple! I can't rate the app because I haven't used it and refuse to. I signed up for the free trial and they charged me $48 for a workbook and $44 for a premium membership, neither of which I signed up for. When asking for an explanation and a refund I simply was told , "Our terms of service don't allow a refund for the workbook (which I never received btw) and we can give you $22 back for your membership." Huh??? I didn't sign up for these, give me my money back! No response!