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No, an account is not required. Your data is stored primarily on your device. iCloud backup is currently on by default; backups are written to your personal iCloud Drive space linked to your Apple ID and are not sent to a server the developer can access. If you use online book search or barcode scanning, the search text or ISBN is sent to third-party book services to retrieve book information.

From Profile → iCloud Backups, you can see the automatic backup status and create an immediate backup with "Back Up Now". iCloud backup is currently on by default; when you leave the app, your library is automatically backed up to your personal iCloud Drive space and the last 5 daily backups are kept. You can also export a .bookbook backup file or CSV from Profile → Export.

Make sure you are signed in to iCloud with the same Apple ID, then tap "Restore" next to a backup in Profile → iCloud Backups. If you have an exported .bookbook file, you can also use Profile → Import → BookBook.

Tap the barcode icon on the Add Book → online search screen and align the barcode on the back cover with the frame. Scanning happens entirely on your device; the camera image is not saved. If camera permission was not requested, you can grant it from Settings → BookBook.

Reminders are off by default. If you enable them, you receive a local notification created on the device at the time you choose; no data is sent to our own servers to schedule notifications. You can turn it off at any time from the app settings.

Widgets refresh automatically when you make a change in the app. If they do not update, open and close the app once. You can also long-press the "Currently Reading" widget and use "Edit Widget" to choose which book is shown.

Subscriptions are managed through Apple: on your device, go to Settings → [Your Name] → Subscriptions → BookBook. For refunds, use Apple's reportaproblem.apple.com page. To restore purchases on a new device, tap "Restore Purchases" on the Premium screen.

You can choose from 9 languages from Profile → Appearance → Language. Widgets also follow the language you select.

Yes. From Profile → Import, you can import Goodreads and StoryGraph CSV exports, Bookmory backups, and BookBook backup files. Your current data is backed up automatically before import.

Profile → Reset Data deletes all app data. To delete iCloud backups, remove the iCloud Drive → BookBook folder in the Files app. Deleting the app removes all BookBook data from the device.