Booky Book organization for Android
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Privacy policy for Booky

This website version mirrors the current in-app privacy notice. It explains transparently which data stays local, which optional features talk to external services, and how Google cloud backup is framed within the product.

Last updated: March 15, 2026

2. What data Booky processes

2.1 Library and wishlist data

Book entries such as title, author, language, category, notes, read/sold state, rating, total pages, current page or reading progress, ISBN, covers, whether a cover was selected manually, whether an entry belongs to the library or wishlist, and for library books optionally the UTC timestamp of when a book was first added are stored locally on your device.

2.2 Export, import, and local backups

If you use export/import, Booky creates or reads transfer files selected by you. Export files can include covers depending on your choice. In addition, Booky can create local restore points on your device, either manually or automatically according to your backup settings.

2.3 Optional Google cloud backup

If you enable the optional Google cloud backup, Booky stores a private app snapshot in the Google Drive appData folder of your Google account. This can include library and wishlist data, relevant cover files, and snapshot metadata such as book count, generation time, app version, and device name.

To show connection status in the app, Booky may also keep local sync metadata such as timestamps of successful syncs, known cloud snapshot times and book counts, and local error or reconnect state. Google does not provide Booky with account name or email address in this authorization flow.

2.4 ISBN, title, and author lookup

When you load book data via ISBN, title, or author search, or manually search for a cover by title inside the app, the ISBN or query is sent, depending on source availability and fallback, to Google Books, the German National Library (DNB SRU), and/or Open Library.

For books already stored locally with ISBN data, Booky may also perform limited background lookups to supplement missing total page counts.

2.5 Suggestions

If you enable personal suggestions, Booky builds a reading profile locally on your device from your library and wishlist. This can involve local processing of authors, languages, categories, series, ratings, read state, and terms derived from titles and descriptions.

Booky may also store a refreshable local suggestion state containing, for example, externally loaded candidate metadata, prepared visible suggestion snapshots, diagnostics, and your suggestion feedback. External suggestion lookups use only derived search signals such as author, category, series, title keywords, ISBN, or thematic terms, never your complete library as one upload.

2.6 Cover downloads

Missing covers can be downloaded from available metadata sources and stored locally. If you select a cover manually, the chosen cover is stored locally and marked as manually set in the app.

2.7 Camera permission

The camera is used only for scanning ISBN barcodes.

2.8 Feedback

When you send feedback, your message, a local technical sender identifier, platform information, app version, and the UTC timestamp of the submission are transported via FormSubmit and delivered by email to SolidStack@outlook.de.

2.9 Donations

Booky may store locally when the app was first launched, how often it has been opened, when a voluntary donation reminder was last shown, and when you last intentionally opened the PayPal donation flow. This is used only to keep the donation reminder rare and unobtrusive.

2.10 No advertising, no third-party analytics

Booky currently does not use advertising SDKs, third-party analytics, or third-party crash reporting.

3. Purposes and legal bases

Local management of your library, wishlist, exports, imports, and backups is carried out to provide the app features you request (Art. 6(1)(b) GDPR).

Optional features involving external transfers or permissions, especially camera scan, Google cloud backup, ISBN, title, and author lookup, limited background completion of missing total page counts, suggestions, manual cover search, feedback, and the donation link, are carried out on the basis of your active use, your consent, and/or to perform your specific request (Art. 6(1)(a) and 6(1)(b) GDPR).

4. Recipients

Data is shared with third parties only when required by a feature you use: Google (Books API, Google Authorization, Google Drive appData folder), German National Library, Open Library, FormSubmit, and PayPal.

5. Transfers to third countries

When using Google, Open Library/Internet Archive, FormSubmit, or PayPal, personal data may also be transferred to countries outside the EU/EEA, especially the United States. Where a recipient is covered by an adequacy decision, the transfer may rely on that. Otherwise, the transfer is based on appropriate safeguards or on your explicit feature-related use.

6. Storage duration and deletion

Local app data remains on your device until you delete it, clear app data, or uninstall the app. Export files remain where you save or share them. Local backup snapshots remain on your device until you delete them or the configured backup limit removes older entries.

If enabled, cloud snapshots remain in your Google account until they are replaced by a newer snapshot, you remove Booky's stored app data from your Google account, or Google deletes them under its own rules.

7. Data security

Booky transmits data to external services only over encrypted HTTPS/TLS connections. On Android, the app requests only the runtime permission required for the respective feature, especially camera permission for ISBN scanning. Cloud snapshots are stored only in the app's private Google Drive appData area. Booky does not sell personal or sensitive data.

8. Your rights

Where the GDPR applies, you have in particular the right of access, rectification, erasure, restriction of processing, data portability, and objection to certain processing. You can withdraw consent for the future.

Independently of that, you can change or delete local data in the app at any time. For questions, contact SolidStack@outlook.de.

9. Provision of data

Providing personal data is generally neither legally nor contractually required for Booky's core functions. However, certain features work only if you provide the necessary data or permissions, for example camera access for scanning, Google sign-in for cloud backup, or network access for external book lookups and feedback.

10. Changes to this policy

This policy may be updated when app features or legal requirements change.