Privacy Policy — Double Digits
Last updated: August 16, 2026
Summary
The developer of this app collects no personal information whatsoever. Your practice records are stored only on your device and are never sent to the developer. The developer operates no servers.
This app contains no third-party analytics, advertising, or crash-reporting software. No account is required.
Information stored on your device
The app stores your practice records on your device only. Three things are saved:
| What | Example |
|---|---|
| Best time for each problem set | Completed "7 × two-digit" in 5:26 |
| Dates you practiced | 2026-08-16 |
| Time history for each completed run | Used to draw your progress chart |
None of this leaves your device. Deleting the app deletes all of it. The developer has no means of viewing it.
About Game Center
This app offers leaderboards through Game Center, a service provided by Apple.
This feature is optional. If you decline to sign in to Game Center, every practice feature of the app remains fully available; only the leaderboard feature is hidden.
If you do use Game Center, the following is sent to Apple:
- Your completion time when you finish a practice run
- Your Game Center nickname (not the real name on your Apple Account)
The submitted time and nickname are visible to other players on the leaderboard. This is inherent to how a ranking feature works.
Game Center is an Apple service, and Apple's handling of this data is governed by the Apple Privacy Policy. The developer does not receive information from Apple that identifies you as an individual.
What this app does not do
For clarity, this app does not:
- Collect your name, email address, phone number, or postal address
- Access your location
- Access your camera, microphone, contacts, or photos (it requests no permissions at all)
- Display advertising or use the advertising identifier (IDFA)
- Track usage with analytics tools such as Google Analytics
- Share or sell information to third parties
Children's privacy
This app is intended for arithmetic practice and may be used by children. As described above, the app collects no personal information, so nothing additional is gathered regardless of age.
Note that the Game Center leaderboard displays your nickname to other players. If a child uses this app, we ask that a parent or guardian review the Game Center nickname setting, and decide whether to sign in to Game Center at all.
Game Center can be restricted from the device under Settings > Screen Time > Content & Privacy Restrictions.
Changes to this policy
This policy may change as features are added to the app. If a significant change is made, the "Last updated" date above will be revised.
Contact
For questions about this policy or about privacy in this app, please contact: