Doozo Privacy Policy

This is a translation of the Japanese Privacy Policy. If the two differ, the Japanese version prevails.

Established: September 23, 2026 Last updated: September 23, 2026

This Privacy Policy (“this Policy”) describes how Hiroki Kataoka (“we”) handles information in the iOS app “Doozo” (“the App”). Please read this Policy before using the App.

The App shows only the photos and videos you choose, so that someone you hand your iPhone to cannot move on to photos you did not choose. The App requires no account, and we operate no server that holds your photos or history. On the free plan, the App shows ads (see 2.3).

1. Who We Are

Operator: Hiroki Kataoka (independent developer)
Contact: kyataoka.deve@gmail.com
App: Doozo (iOS)

2. Information We Obtain

2.1 Photos, videos, and history — never sent to us

The App shows the photos and videos you choose in the iOS photo picker, and stores each set you showed as “history” on your device. We never receive the photos or videos themselves, which photos you chose, or the contents of your history.

If you allow full access to your photo library, the App stores only the identifiers of the chosen photos on your device and reads them from the library each time they are shown.
Otherwise (limited access, denied, or not yet decided), the App copies the chosen photos and videos into its own storage. These copies are excluded from device backups such as iCloud Backup.
If you send photos or videos to the App from another app’s share sheet (such as Photos), the App also copies them into its own storage, likewise excluded from device backups.
History (a Doozo Plus feature) includes when you showed it, its order, and any name or pin you added. All of it stays on your device.
The time and number of times the App went to the background while you were showing photos are kept on your device only, to show you a notice afterward.

2.2 Purchases

Paid plans are purchased only through Apple’s In-App Purchase. The App checks your purchases with Apple (StoreKit) on your device. We never receive payment details such as card numbers. We use no third-party service to manage purchases.

2.3 Ads

On the free plan, the App shows ads using the Google AdMob SDK (Google LLC). To deliver ads, count impressions, and prevent fraud, information such as the following is sent to Google:

Approximate location estimated from your IP address (country or region level)
Device information (device type, OS version, etc.), ad impressions and taps, and diagnostic information about the ad SDK

The App does not ask for tracking permission and does not use the advertising identifier (IDFA). It requests non-personalized ads. In the European Economic Area and the United Kingdom, only limited ads are served, because the App uses no consent management tool.

The ad SDK never reads your photos, videos, or history. We receive only aggregate figures such as impressions and revenue. With a paid plan (No Ads or Doozo Plus), the ad SDK is not initialized and no information is sent for ads.

Google handles this information under its Privacy Policy (https://policies.google.com/privacy).

2.4 Usage data (to improve the App)

The App records which features are used (for example, starting a handoff or opening the plans screen), using only predefined event names and values. It sends them with Google Analytics for Firebase (Google LLC).

Photos, videos, history names, counts, and dates are never sent. No signals for advertising are sent, and the data is not linked to anything that identifies you or to advertising identifiers. You can turn this off at any time in the App’s Settings (Privacy → Share Usage Data). The App uses no crash reporting service, and does not sync your history or photos with iCloud or any other cloud service.

2.5 Feedback and questions

When you send “Feedback and Questions” in the App, only the type you chose (bug, request, or other), your message, the app version, the iOS version, and the device model are sent. Because nothing identifies you, we cannot reply. It is stored in Google Cloud Firestore (Google LLC), and sending goes through Firebase App Check, which confirms the request comes from a genuine copy of the App. It is stored in the Tokyo region (asia-northeast1).

3. How We Use Information

2.2: To provide paid plans, turn paid features on or off, and restore purchases
2.3: To fund the free plan with ads, by delivering, displaying, and measuring ads and preventing fraud (used by Google)
2.4: To learn which features are used and decide what to improve next
2.5: To investigate problems and improve the App

We never sell or rent information to anyone, and we do not provide it to third parties except as required by law.

We use the following services to provide the App:

Apple Inc. (App Store / In-App Purchase): payment processing and subscriptions
Google LLC (Google AdMob): ad delivery and measurement on the free plan
Google LLC (Firebase: Google Analytics / Cloud Firestore / App Check): aggregating usage data (2.4) and storing feedback (2.5)

Their servers may be located outside Japan.

5. Where and How Long Data Is Kept

Photo identifiers, copied photos and videos, and history are stored on your device in the App’s own storage, never on our servers.
History is kept only while you use Doozo Plus, until you delete it or it is removed by the “Delete History Automatically” setting. Deleting a history also deletes its copied photos and videos.
Without Doozo Plus, no history is kept, and copied photos and videos are deleted after you finish showing them. When Doozo Plus ends (including when a free trial ends), all history and copies are deleted.
Photos and videos sent from another app’s share sheet that were not shown, or that were sent while you did not have Doozo Plus, are deleted when the App is opened.
Deleting the App from your device removes all history and copies on the device. Photos in the Photos app are never deleted.
Feedback (2.5) is kept in Google Cloud Firestore in the Tokyo region as long as needed to respond and improve the App, and deleted when no longer needed.
Retention of ad data (2.3) and usage data (2.4) follows Google’s policies.

6. Your Choices

Photo library access: change it at any time in the iOS Settings app. The App works without full access (photos are copied).
Deleting history (Doozo Plus): delete it item by item in the App, or all at once with “Delete All History” in Settings.
Usage data: turn off “Share Usage Data” in Settings at any time.
Ads: with a paid plan (No Ads or Doozo Plus), no ads are shown and the ad SDK is not initialized.

7. Biometrics (Face ID, etc.)

The lock in Doozo Plus uses your device’s biometrics (such as Face ID) to unlock. Matching happens entirely within iOS; the App never obtains, stores, or sends biometric data. The App receives only whether authentication succeeded.

8. Minors

Minors should use the App with the consent of a parent or guardian.

9. Changes to This Policy

We may update this Policy to reflect changes in law or in the App. We will announce important changes in the App or where this Policy is published.

10. Governing Law

This Policy is governed by the laws of Japan.

11. Contact

Hiroki Kataoka
kyataoka.deve@gmail.com