I’m recommending Nicole Hennig’s Apps for Librarians: Using the Best Mobile Technology to Educate, Create, and Engage. She details the developer, version, platform, price, explanation of how it works and what it does, Audience, Examples, and Other Apps Worth Trying on several apps in several categories. The chapters include Apps for Research and Reference, Apps for Taking Notes and Writing, Apps for Communication, Apps for Reading, and many more. Because a book like this might have a short shelf-life (ha!) she also has a website http://nicolehennig.com/books/apps-librarians-book/ in which she writes about the changes made in some of the apps since the book was written. And she has a newsletter! http://nicolehennig.com/mobile-apps-news/
Check this all out if you’re a teacher librarian, a teacher, or a student and you love apps.