The article reviews six book cataloging apps: Book Track, Library Thing, Libib, Leto, Book Buddy, and Bookshelf. The author tests each app's functionality, ease of use, and aesthetics by adding the same 10 books to each app. Each app has its pros and cons, with some offering robust features like sorting options and manual add functions, while others are more visually appealing or user-friendly. The article concludes that each reader may find a different app suits their needs best.