1. Overview

Zahlinova is a math training app designed to sharpen mental arithmetic through focused, adaptive exercises. This policy explains what data the app handles, how it is stored, and what — if anything — is shared with third parties.

2. Data Stored on Your Device

Zahlinova stores the following data exclusively on your device using local device storage (Room database on Android / local storage on iOS). This data is never transmitted to the developer or any third party.

What we do NOT collect

• Analytics or usage statistics
• Crash reports
• Advertising identifiers
• Location data
• Contacts, camera, microphone, or file access
• Any personally identifiable information

3. Network Communication

Zahlinova operates fully offline. The app makes no network connections except:

• Google Play Billing / Apple App Store — solely to process the optional one-time Pro purchase. This communication is handled entirely by Google / Apple; we do not receive or store your payment details.

No data is sent to any server operated by the developer.

4. In-App Purchases

Zahlinova offers an optional one-time purchase (Zahlinova Pro) to unlock the full feature set.

• Payments are processed by Google Play (Android) or Apple App Store (iOS).
• We receive only a confirmation that the purchase was completed — no payment details, card numbers, or billing addresses.
• Purchase status is stored encrypted on your device.

For questions about billing, refunds, or payment data, please contact Google or Apple support directly.
Google Play Privacy Policy: policies.google.com/privacy
Apple Privacy Policy: apple.com/legal/privacy

5. Data Sharing

We do not share any data with third parties. There are no advertising networks, analytics providers, or data brokers involved.

6. Data Retention and Deletion

All data stored by Zahlinova resides on your device.

• To delete all app data: uninstall the app. This permanently removes all stored training history, scores, and settings.
• Within the app you can also clear your training history via the settings menu.
• No data is held on any server operated by the developer, so no additional deletion request is necessary.

7. Children's Privacy

Zahlinova is a math training tool suitable for all ages. The app does not knowingly collect any personal data from users of any age. Since all data is stored locally on the device and never transmitted, there is no risk of unauthorised access to children's data through our services.

8. Changes to This Policy

If we make material changes to this policy (e.g. if analytics or crash reporting are added in a future version), the updated policy will be published here and the "Last updated" date will be revised. Continued use of the app after changes constitutes acceptance of the updated policy.

9. Contact

For privacy-related questions or requests:

Said El Mallouki
Am Werlauer Hang 6
56329 St. Goar, Deutschland
apps@codingspree.de

Michael Krümmling
Magdeburger Straße 7
64579 Gernsheim, Deutschland
apps@codingspree.de

10. Impressum (gem. § 5 TMG)