I think that this company has really hit the mark here in terms of a simple design and something that is appropriate to simply hand to your toddler. (You need to do a long press to go into the settings, for example. The buttons are big and easy to touch. The letters are big and easy to read; there is a dearth of distracting images and patterns that I have seen in some other programs.)
I was super impressed with the variety of categories. It seems that this app will grow with my child where as my daughter has quickly gotten tired of other apps which she has played over and over and learned all the answers.
One thing I would like to see and one small complaint: the voice that asks the questions is much quieter than the cheering kids voices and clapping that follows a loud answer. I the wee hours of the morning or at a restaurant/public place this makes it impossible to find a balance between a level where the instructions are still audible but the other sounds are not too loud to make it inappropriate to play. It would be awesome if you could either control the volume of these separately, if they were normalized, or if there were the option to have a quiet mode where the reward was visual or a simple "Good job!" at the same volume as the instructions.
Another feature request which would build on what already is a great idea by the creators of this app: currently you can choose to be quizzed on numbers in a range of 1-10 or 1-99. To me 1-20 would be ideal since this is a more typical range for early number learning. (The teens are unique whereas everything from 20-99 follows a predictable pattern). Perhaps a 1-10, 1-20, and a 1-99 mode?
All in all I have searched for and tried dozens of apps and feel this one is a must-have. You absolutely cannot beat the price.
WELL DONE!
Mpcc about Complete Toddler Preschool, v4.1