Privacy Policy
This page explains how the iOS app “Karakuri Domino” (the “App”) handles information. The App is provided by Hironori Hara (the “Operator”). If this English version differs from the Japanese version, the Japanese version prevails.
1. No accounts
The App has no sign-up. You can “Sign in with Apple” only to use backups (every feature works without it). We do not collect your name, email address, phone number or postal address (even when you sign in with Apple, we do not receive your email or name). We do not use analytics tools.
2. Information kept on your device
The following is kept on your device. Unless you use backups, it is never sent to the Operator and is deleted when you delete the App.
- Machines you build in Create
- Challenge progress and ranks
- Settings (sound, haptics, language, etc.)
- The state of your purchases (you can restore them from the App Store with “Restore purchases”)
- Works you liked, people you chose to hide, and works you reported
3. Information stored on Google Firebase
For Community works and to count users, the App uses Firebase (Authentication and Cloud Firestore) by Google LLC.
| Information | Purpose |
|---|---|
| An anonymous user ID created automatically by the App (not linked to anything that identifies you) | Counting users; keeping likes, views and reports to one per person; recognizing your own works |
| Works you publish (name, layout of parts, time published) | Showing them to others in Community works |
| Records of works you viewed, liked or reported (including the reason) and when | Showing view and like counts, sorting by popularity, handling inappropriate works |
| When you last published | Preventing rapid repeated posting |
| Backups (only if you Sign in with Apple): the user identifier issued by Apple, the names and layouts of your works, Challenge records, and your like, hide and report records | Restoring your data with the same Apple ID after deleting the App or changing devices. Only you can read or write it, and the Operator does not use it for any other purpose |
You can delete your backup and sign-in record at any time in Settings → Delete backup and account (data on your device is kept).
You can delete your published works at any time in Community works → Mine. The Operator may hide or delete works that break the rules.
See Privacy and Security in Firebase for how Firebase handles data.
4. Ads (Google AdMob)
The App shows ads through AdMob by Google LLC. To serve ads, measure them and prevent fraud, AdMob may use your device’s advertising ID, your approximate region based on your IP address, device and app information, and records of ad views and taps.
- On iOS, the App first asks for permission to track. Personalized ads are shown only if you allow it. Every feature works either way, and you can change your choice in iOS Settings → Privacy & Security → Tracking.
- In the EU, the UK and some other regions, the App shows an ad consent form. You can change your choices later in the App’s Settings → Ad privacy settings.
See How Google uses information from sites or apps that use our services and the Google Privacy Policy.
5. In-app purchases
All purchases are processed by Apple. The Operator does not receive your payment details.
6. Children
The App is intended for a general audience and is not directed at children.
7. Sharing with third parties
Except as required by law, we do not share information with third parties for purposes other than those described above.
8. Changes
We will announce any changes to this policy on this page.
9. Contact
For questions about this policy or to request removal of a published work, please use the contact form.
Operator: Hironori Hara
Effective: October 16, 2026 (updated October 17, 2026: backups with Sign in with Apple)