I used to keep track of books, movies, and shows etc. on plaintext lists, but these apps designed specifically to keep those lists yet also provide additional information and a better interface are so nice, this is the best one I found for keeping track of books.The app is updated fairly frequently for this type of app also the developers seem to care about improving this experience.Update: using this app again after not using for awhile and book collection has grown exponentially. I love the variety of types of categorization (categories, tags, physical location, and many more options including custom fields you can create. This is helpful as my books are all over the place-multiple physical locations, kindle, Apple Books, audible, etc. There are also many options for tracking progress and status of books. The design of the app allows for vast complexity in organization while maintaining simplicity in user interface and makes it easy to edit the metadata on the fly. I also own book track app, which also has Mac app, but the design and usability of Book Buddy made me confident going all in with this app. Hopefully, with Catalyst and other developments on the Mac, this app will eventually be ported to the Mac also, which I would absolutely pay for again!