Kuyu Privacy Policy
Kuyu has no account, no server of its own, no ads and no analytics. Only when the app crashes or hits an error does it send a technical error report without your name, email or IP address. This page explains what the app keeps on your device, what an error report contains and what is never collected.
1. Data collected: error reports only
Kuyu has no accounts, asks for no credentials and does not read your location, contacts or photos. The app contains no analytics, advertising or tracking libraries; its only third-party library is the Sentry error reporter (section 6), which uses a device identifier only as a non-reversible hash. Its Apple privacy manifest declares crash data and other diagnostic data for these reports, not linked to your identity and not used for tracking, and lists the system interface (UserDefaults) the app uses to keep its own settings on your device.
2. What stays on your device
Your daily puzzle progress, the days you solved and their times, your streak, your settings (haptics, sound, appearance, free-play difficulty) and whether the tutorial was shown are kept only in the app's storage on your device. They are never sent to us or any other server and are deleted when you delete the app. Depending on your iOS backup settings they may be included in a device backup, which is subject to Apple's terms.
3. Network access
Kuyu needs no server to play. The daily puzzle is generated on your device from a number derived from the date, so everyone sees the same board on the same day. The only connection the app makes is the error report after a crash or error (section 6).
4. Sharing
The "Share" button opens the iOS share sheet. What you share is a short line with your result and a link to this page; you decide where it goes, and Kuyu does not record it.
5. Apple and the App Store
The app is distributed through the App Store. Data Apple collects during download or, if you allowed it in iOS settings, with anonymous crash reports is subject to Apple's privacy policy. OzyCore can see only the aggregated, anonymous statistics Apple provides to developers.
6. Crash and error reports
Newer versions of Kuyu use Sentry, a service of Functional Software, Inc., to detect and fix crashes and technical errors; older versions send no error reports. The data is stored in the EU (Frankfurt, Germany) and deleted automatically after 90 days at the latest; Functional Software, Inc. is based in the USA and certified under the EU-U.S. Data Privacy Framework. Only when the app crashes or hits an error is a report sent, after a crash at the next launch. It contains technical information such as device and operating-system model and version, device state (for example free memory, battery level, screen orientation), language and time-zone settings, the app version, the error type and error trace, a short trail of app events before the error (such as screen changes and taps), a random identifier the error reporter creates for this installation and a non-reversible hash it derives from Apple's identifier for apps from the same developer (identifierForVendor), the device model and the app identifier. The app adds no names, email addresses or IP addresses to reports and tells Sentry not to add the connection's IP address to the report. The legal basis is Art. 6 (1) (f) GDPR; our legitimate interest is detecting and fixing technical errors.
7. Children
Kuyu has no account and asks nothing about you; error reports contain technical information only. The app contains nothing that requires an age limit.
8. Future features
If optional online features such as Game Center rankings or iCloud-based duels are added later, this page and the App Store privacy label will be updated before the feature is released.
9. Rights and contact
The data controller is OzyCore GmbH, Kreuzberger Ring 24, 65205 Wiesbaden, Germany. Kuyu keeps no records about you, and error reports contain nothing we could match to you, so there is no data we could link to you for access, correction or deletion; send any questions to info@ozycore.de. You can object to the processing for error reports under Art. 21 GDPR and lodge a complaint with a data protection supervisory authority.
10. Changes
If this policy changes, the current version is published on this page with an updated date.
Last updated: 9 October 2026