Great app, one problem – Todo Math Review

Love this app. My kids think it's great. Wish it went higher, but I get that's not the purpose. That's okay. What's not okay is the fact that my account doesn't sync across devices. If I'm going to pay a monthly fee for it, I should be able to have my kids progress the same from the iPad to the iPhone. ?
Review by doubleyouteeeffmate on Todo Math.