Great for therapy!
I love this app and use it a lot during speech therapy. The only thing I would change is let the user choose how many letters are displayed and then whether or not they say the word before you spell it. I have some clients who can spell cat by memory but they have difficulty recognizing the phonological sound of each letter in cat.
All in all its great!
Sswhite12 about
SUPER WHY!, v1.4