Change starting level
Open “Progress”, then Settings, and select your new starting level.
KOPFRECHNEN+ SERVICE
Kopfrechnen+ Support & Privacy
Required information and help for the iPhone and iPad app – without a marketing page or user account.
Support
The most common questions can be resolved directly in the app. For further help, contact the office by phone.
Restore Premium
Open Premium and tap “Restore Purchases”. Your purchase is verified through your Apple ID.
Delete training data
Under “Progress → Settings”, you can delete all training data stored locally on your device.
Personal support
Please have your device model, iOS version, and a short description of the issue ready.
Privacy Policy
No account is required for training. Results and progress are stored locally. Advertising is requested only after the required privacy choice has been completed.
1. Controller and contact
Jack Savelsberg · savelsberg.tech · c/o Autorenglück #88296, Albert-Einstein-Str. 47, 02977 Hoyerswerda, Germany. For privacy and support inquiries, call the office at +49 30 690 390 35.
2. Local training data
Starting level, points, response times, sprint results, streaks, and settings are stored only on the device. This training data is not transmitted to the provider or Google and can be deleted completely in the app settings.
3. Advertising with Google AdMob
The free version uses Google AdMob. The Google Mobile Ads SDK may process data including the IP address, general device location, device identifiers, advertising and interaction data, performance data, and non-user-related crash diagnostics. Kopfrechnen+ does not transmit answers or personal training histories as custom advertising data. See Google’s Privacy Policy for further information.
4. Consent and choices
Google User Messaging Platform is used for users in the European Economic Area, the United Kingdom, and Switzerland. Where required, users can allow, refuse, or manage personalized advertising. The choice can later be changed or withdrawn through “Privacy options” in the app settings. Personalized ads are not requested without the relevant consent.
5. Premium and purchases
The optional one-time “Premium ad-free” purchase is handled by Apple. The app receives only whether a valid purchase entitlement exists. Kopfrechnen+ does not process payment data. Apple’s processing is governed by Apple’s Privacy Policy.
6. Retention and rights
Local training data remains until it is deleted in the app or the app is uninstalled. Data processed independently by Google or Apple is subject to their respective retention periods. Questions about access, correction, deletion, restriction, or objection can be directed to the office by phone. You also have the right to complain to a competent data protection authority.
Last updated: August 31, 2026