Privacy Policy

Last updated: August 30, 2026

This Privacy Policy applies to the Deck Builder app (hereinafter referred to as the “Application”) developed by Julian Bokelmann (hereinafter referred to as the “Service Provider”) as a completely ad-free service. This service is provided “AS IS”.

Where the Application runs. “Application” means the Deck Builder Android app and the Deck Builder web app at app.deckbuilderapp.app. Both use the same account, the same cloud storage and the same Deck Store; a deck synced from one is available in the other. Where a section applies to only one of them, it says so. The marketing website at deckbuilderapp.app is covered separately in the analytics sections below.

Decks stay on your device unless you choose otherwise. In the web app, your decks, cards, collections and their settings are stored inside your browser (IndexedDB) on the device you are using. They are not transmitted anywhere unless you sign in and use cloud sync, which is a Pro feature. Clearing your browser's site data deletes them, and the Service Provider cannot recover them.

1. Information We Collect

The Application may collect the following types of information:

2. How We Use Information

Collected information may be used to:

Analytics Disclosure: We use Firebase Analytics which collects device identifiers (such as Android Advertising ID) and usage data to help us understand how users interact with the Application. This data is used to improve app performance and user experience. You can opt out of personalized advertising by adjusting your device's ad settings.

Website Analytics: Our marketing website (deckbuilderapp.app) uses Cloudflare Web Analytics to count visits and understand which pages people read. It is cookieless: it stores nothing on your device, sets no identifier, and does not follow you between sites or between visits. It records the page being viewed, the referring source, and general device and browser type, and derives an approximate country from your IP address. The IP address is used for that and is not stored by us. There is no profile, no cross-site tracking, and none of it is used for advertising.

Because it stores nothing on your device and cannot identify you, it runs without a cookie banner. If you prefer not to be counted at all, any tracker-blocking browser extension or setting will block it, and the website works exactly the same with it blocked.

Google Analytics is no longer used on the marketing website. Until 30 August 2026 the site offered Google Analytics behind a consent banner. It has been removed entirely, along with the banner. Google Analytics is still used inside the Deck Builder web app at app.deckbuilderapp.app, where it remains strictly opt-in, as described above.

3. Third-Party Services

The Application uses third-party services that may collect and process data according to their own policies. The principal providers and their roles are listed below; please review their privacy policies:

4. Data Sharing and Disclosure

We may disclose user information in the following circumstances:

5. Your Rights (GDPR and Other Laws)

Depending on your location, you may have the following rights regarding your personal data:

To exercise these rights, contact us at privacy@deckbuilderapp.app. Please send your request from the email address associated with your account so we can verify your identity. Requests from other addresses may require additional identity verification before we can process them. You can also stop most information collection by uninstalling the Application or adjusting device permissions. In the web app, signing out and clearing this site's data in your browser removes the locally stored decks and the browser identifier from that device.

6. Data Retention

We retain your data as follows:

We may retain certain data longer if required by law or for legitimate purposes such as fraud prevention, resolving disputes, or enforcing our terms.

7. Account Data and Deletion

If you sign in with Google, your account data (email, username, synced content) is stored in Firebase. You have control over your data and can delete it at any time.

Disabling Cloud Sync:

You can disable cloud sync at any time in Settings → Account. When you confirm disabling, all synced decks, cards, collections, tags, and images are permanently deleted from our servers. Local data on your device is not affected. If you wish to keep your cloud backup but stop syncing, do not disable sync; simply close the app or keep your device offline.

If your Pro Subscription expires, sync is automatically disabled but cloud data is preserved and becomes accessible again if you resubscribe. (The Pro Lifetime Purchase does not expire, so this scenario does not apply to lifetime holders.)

Removing your published decks from the Deck Store:

You can withdraw individual versions or your entire deck from the Deck Store at any time using the "Withdraw" function on the deck details screen, or by emailing privacy@deckbuilderapp.app with the subject "Deck Store Removal Request". A backup copy is retained for 90 days for moderation and rollback purposes, then permanently deleted from our servers. Copies already downloaded by other Users remain on those Users' devices and cannot be recalled (see Terms of Service § 5.5(2)).

How to delete your account:

Send an email to privacy@deckbuilderapp.app with the subject "Account Deletion Request". The request must be sent from the email address associated with the account to be deleted (this serves as identity verification via the authenticated sender). Requests sent from other addresses will be rejected or processed only after additional identity verification. We process deletion requests within 30 days. An in-app option (Settings → Account → Delete Account) is planned and will be added as a second path once implemented.

What happens when you delete your account:

Data we may retain after deletion:

Note: Account deletion only removes data stored on our servers. Local data on your device (decks stored offline) is not affected and can be removed by uninstalling the app or clearing app data.

Account deletion requests are processed within 30 days. You will receive confirmation at your account email address once deletion is complete.

8. Children's Privacy

The Application is not directed to children under 13. We do not knowingly collect information from children under 13. If you believe your child has provided personal data, please contact us so we can remove it.

9. Security

We implement physical, electronic, and procedural safeguards to protect user data. However, no security system is completely secure, and we cannot guarantee absolute protection.

10. Changes to This Privacy Policy

This Privacy Policy may be updated from time to time. We will notify users by updating this page. Continued use of the Application after updates constitutes acceptance of the revised Privacy Policy.

11. Consent

By using the Application, you consent to the processing of your information as described in this Privacy Policy, including collection, storage, use, and disclosure of data.

12. Contact Us

If you have questions about this Privacy Policy or data practices, please contact:

Julian Bokelmann
Email: privacy@deckbuilderapp.app

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