The library
Everything you own on one shelf: cover tiles or a compact list, grouped by author, year or category, with search across the lot. It works offline once the covers have loaded, and it is backed up quietly — iCloud on Apple devices, Google Drive auto backup on Android.
Adding a book takes seconds, four ways in: scan the barcode, photograph the printed ISBN or the cover, or type the title. Matches come from Google Books, Open Library and isbnsearch.org.
Every book, its page
Read, reading or unread; star ratings, favourites and the date you finished. Each book keeps its cover, edition and notes, so the library reflects how you actually read, not just what you shelved.
Coming from elsewhere? Import the CSV exports of Goodreads, StoryGraph or LibraryThing, and export your own library in the same format whenever you want it back out.
Do I own this?
Standing in the bookshop, point the camera at a barcode for an instant verdict, along with the rating and reading status you gave your copy. No more buying the same paperback twice.
The check is one tap away: Control Center and Siri on iPhone, a Quick Settings tile and a long-press shortcut on Android.