The Very Hungry Caterpillar & Friends - First Words is a mash-up of Eric Carle illustrations in a digital pop-up book that teaches words. Language options include English, Spanish, French, simplified Chinese, and German, so the book app can be used with toddlers learning a first language or with any age learning new languages. Though the interface is easy enough that preschoolers could use it on their own, the parent section explains that its designed to be explored by kids and parents together.