Words w/ William is an excellent iOS app for PreK/Toddlers learning the alphabet, numbers, and colors. The way this works is a child watches William and selects the letter, number, or color he asks for. It's very easy to use and has a feature for parents to turn on/off what they want their child to learn.
I recommend checking out Words w/ William by clicking here!!
For my Pinterest board on Educational iOS Apps click here.
For my Edshelf collection on Educational iOS Apps click here.