I have one in kindergarten also that loves the app. You can select different categories such as high impact words and 2 word combinations. The design is completely kid friendly and there is no instruction needed for your child to start learning the words and sounds.
Here are some screenshots from the app:
There are 2 versions of this app.
Learn To Talk First Words – Preschool,Kindergarten Flashcards:
Learn To Talk More Words – Preschool,Kindergarten Flashcards: