They say caterpillars reproduce quickly. Such is the case with the Very Hungry Caterpillar in the app store these past few months. This time, StoryToys has mixed the celebrity insect with their well designed "First Words" series, creating one of the most beautifully illustrated sets of bi-language drills you can imagine.

The thirteen 3D pop-up pages unfold, letting children freely explore 80 common words in English, French, German and Spanish (but no Chinese).

The touch and hear pedagogy works, helping to make the connection with new words while reinforcing those you already know. The downside -- there's not much of a story.