Bookspine keeps a reader's current book visible on the Home Screen. The free small widget shows the book cover or spine and reading progress, and can add pages without opening the app. Users can keep unlimited books, search by title or author, scan an ISBN, and set an annual reading goal. Finished books remain on a shelf, and the app works offline with manual book entry. Bookspine Pro is a one-time purchase that adds larger Home Screen widgets, Lock Screen widgets, annual reviews, Goodreads import, spine colors, and optional iCloud sync. The listing says books stay on device unless users enable iCloud sync, and the developer does not receive the library.
