Privacy Policy — NineSmith Sudoku
Last updated: 2026-06-09. This document describes how data is handled in the NineSmith Sudoku iOS app (the App), developed by Nikodem Kustusz (quero / querosdev).
1. What data we collect
Almost nothing. The App runs entirely on your device.
Data stored only on your device
- Game progress (current puzzle, history, notes)
- Statistics (daily streak, games played, mastery level)
- Settings and preferences
- A local in-app event log — exported only manually by a tester via a support gesture, never sent automatically to any server
Data collected by RevenueCat (purchases only)
If you purchase NineSmith Premium, the transaction is processed by RevenueCat. RevenueCat may collect:
- A pseudonymous user ID (randomly generated, not linked to your name or email)
- Purchase receipt data (handled by Apple)
- Basic device information required for entitlement verification
RevenueCat privacy policy: revenuecat.com/privacy. Apple handles all payment processing — we never see your card or payment details.
2. What we do NOT collect
- Name, email address, or any personal identifiers
- Location data
- Contacts or photos
- Advertising identifiers (no ads in this app, ever)
- Data from social networks
3. Third-party services used
- RevenueCat — in-app purchase entitlement verification
- Apple App Store — payment processing
No analytics SDKs, no advertising SDKs, no crash reporting SDKs are used.
4. Data retention
All local data stays on your device. Deleting the App removes it permanently. We hold no server-side copy of your data.
5. Children
NineSmith Sudoku is rated 4+ and appropriate for all ages. We do not knowingly collect data from children.
6. Changes to this policy
If we add features that change data practices, we will update this page and the date at the top.
7. Contact
For privacy questions, email: nikodemkustusz@gmail.com