Information We Collect
Chess Master for Kidz stores the following information locally on your device only. This data never leaves the device, is never uploaded to any server, and is not accessible to Nalkudil Studio.
| Data | Purpose |
|---|---|
| Player name | Personalising DR's messages and greetings |
| Skill level selection | Setting the starting DR difficulty |
| Game results and rating | Showing progress on the Profile screen |
| Puzzles solved and streaks | Tracking learning progress |
| Parental control settings | Screen time and access control |
| App preferences | Remembering voice and timer settings |
What We Never Do
We do not collect names, email addresses, location data, device identifiers, advertising IDs, usage analytics, crash reports, photos, camera or microphone access, or any data from children under 13.
Internet Access
Children's Privacy (COPPA & GDPR-K)
This app is designed for children aged 6–14. We take their privacy more seriously than anything else.
- We do not knowingly collect any personal information from children
- We do not require account creation or login of any kind
- We do not include social features, chat, or user-generated content
- We do not display advertisements of any kind
- Parents can review all data stored by going to Settings → Parental Controls
- All data can be permanently deleted by uninstalling the app
Parental Controls
The app includes built-in parental controls accessible from Settings → Parental Controls.
PIN Protection
Set a 4-digit PIN to restrict access to settings. Stored as a one-way SHA-256 hash — we cannot recover it.
Screen Time Limits
Set daily play time limits. DR reminds your child to take a break when time is up.
Progress Dashboard
Weekly activity, rating trends, puzzles solved — visible only to you.
Fingerprint Unlock
Enable biometric authentication as an alternative to PIN entry.
Open Source Credits
| Component | Licence | Source |
|---|---|---|
| Stockfish Chess Engine | GPL v3 | stockfishchess.org |
| Lichess Puzzle Database | CC0 (Public Domain) | lichess.org |
| Jetpack Compose, Room, Hilt | Apache 2.0 | developer.android.com |
Sound effects courtesy of Lichess.org (CC BY-NC 4.0).
Data Deletion
To delete all data stored by the app, simply uninstall the app from your device. No data is stored remotely, so uninstalling removes everything completely and permanently.
Changes to This Policy
If we update this privacy policy, the new version will be published at this page and reflected in the next app update. We will not retroactively reduce protections for data already collected without appropriate notice.
Contact Us
Questions about this privacy policy? We're a small family studio — every message is read personally.