This app is fairly good. I'll be sure to remember the stroke orders in no time. Practice really does make perfect. The only complaint, well suggestion, is that you (creator), allow the users some way of knowing what the letters are other than having to listen to that child's voice. It's kind of annoying and hard to decipher. Like after we write it, there should be a button that would show up so we can see the pronunciation, if we clicked it. Like a flash card. After tracing か we can see that it is "ka".
Overall, this is a wonderful app if you're wanting to learn hiragana letters. This won't teach you words or phrases. It only helps with correct stroke orders.
Thanks for taking the time to read this.