Last updated: November 12, 2026
1. Introduction
T.K Apps ("we") respects your privacy and works to protect your personal information when you use the iOS app "BookDeck" (the "App"). This policy explains how information is handled in the App.
2. What the App stores
The App stores the following information, which you enter or choose.
| Type | Details |
|---|---|
| Book information | Title, author, publisher, ISBN, release date, cover image URL, description and other bibliographic data retrieved from book search services |
| Reading records | Reading status, rating, date added, date started, date finished, memos and thoughts, series name, tags |
| Photos | Photos you register as a cover |
| App settings | Appearance, theme color, shelf display options, Premium state and so on |
| Exported data | Shelf data you export as CSV or as a backup file |
3. Where information is stored
Your shelf, reading records and photos are stored on your device. The App does not send or store your reading records or photos on any server of our own, and there is no account to create.
If you use your operating system's backup, sharing or export features, you are responsible for how the information is handled where it ends up.
4. iCloud sync
The books on your shelf, along with tags, series, memos and reading records, are stored in your own iCloud (a private database provided by Apple) and synced between devices signed in to the same Apple Account. We cannot see or retrieve any of it.
Photos you register as covers are not synced. They stay on the device where you added them.
If you are not signed in to iCloud, your records stay on your device only and nothing is synced. You can check the sync status in the App under Settings > iCloud Sync.
Information stored in iCloud is handled according to Apple's privacy policy.
5. Retrieving book information
The App uses the Rakuten Books API, provided by Rakuten Group, Inc., to search for books and retrieve bibliographic data and cover images. When you search, the terms you enter (title, author, ISBN) are sent to that service. Cover images are fetched from that service's image URLs and cached on your device for display.
Page counts are retrieved from the National Diet Library Search, openBD and the Google Books API.
Links in the App to buy a book (Amazon "Print" and "Kindle", Rakuten "Rakuten Books" and "Rakuten Kobo") are affiliate links. Information at the destination is handled according to that service's own policy.
We are a participant in the Amazon Associates Program, an affiliate program designed to provide a means for sites to earn referral fees by advertising and linking to Amazon.co.jp. We also participate in the Rakuten Affiliate program. If a product is purchased through a link, we may receive a referral fee, at no additional cost to you.
As an Amazon Associate, T.K Apps earns from qualifying purchases.
6. Camera and photo library
The App may ask for camera access in order to scan the barcode on a book. The camera feed is used only to read the barcode; it is not stored or transmitted.
The App may also ask for camera or photo library access so you can register a cover photo. Photos you take or choose are used only to display a cover inside the App and are stored only on your device.
7. Advertising and tracking
The App may show ads to users on the free plan. Ads are delivered by Google AdMob. Ad providers may collect device information, an advertising identifier and usage information in order to display ads, prevent fraud and measure ad performance.
On iOS, the App asks for permission through App Tracking Transparency (ATT) where required. The App's core features work whether or not you allow it.
8. Apps you may like
The Settings screen lists other apps by the same developer. To build that list, the App fetches a static file over HTTPS (a GET request only). No information about you is sent, and the list is cached on your device.
9. Purchases
The App may offer a paid plan (Premium) that includes hiding ads and CSV export. In-app purchases are processed through Apple's StoreKit and the App Store. We never receive or store your payment details, such as a credit card number.
10. Sharing with third parties
We do not provide your information to third parties without your consent, except where required by law, where necessary to protect users or prevent misuse, or to the third-party services described in this policy.
11. Deleting data
You can delete books, reading records, photos, tags and series from within the App. If you uninstall the App, the data it stored on your device is removed as your operating system specifies. To remove synced data, delete it in the App while signed in to iCloud, or turn off iCloud for the App in your device settings.
Any CSV or backup files you exported are yours to manage and delete.
12. Changes to this policy
We may revise this policy as needed. When we do, we will publish it on this page and update the date above.
13. Contact
For questions or comments about this policy, please contact us.
T.K Apps
tkapps.support@gmail.com