As schools around the country implement the Common Core State Standards (CCSS), teachers and school librarians are looking for ways to incorporate more engaging nonfiction reading. The quantity of informational texts students will be required to read will increase drastically, and students will be asked to apply higher-level thinking skills to these texts. Interactive book apps offer innumerable possibilities for exploring nonfiction texts. App developers and publishing houses are exploring possibilities for drawing readers into books by integrating high-impact illustrations and photographs, providing engaging interactive elements, and adding interesting text. The CCSS expect students to read "digital sources" along with print texts. Digital sources are not limited to websites, but can include online articles, databases, and book apps. Book apps offer a focused, tactile, interactive experience for students--one that educators should consider as an integral component of digital literacy. Book apps (short for "application") are interactive computer programs available for touch screen tablet computers such as Apple's iPad. Users can interact with these computer programs by swiping their fingers to turn the page, tapping to activate a video, and manipulating objects on the screen. Unlike ebooks, book apps, are interactive books, in which readers can poke or press different parts with a response to those actions. School librarians, however, are struggling to find high quality, engaging apps to use in the classroom and library. In this article, the authors take a look at several nonfiction book apps that integrate keys features of this new platform.