mathdistrict logo

Intelligent Learning & Training Software

Developed by Dr Claus Zinn

Computer Scientist and Educational Researcher

Learning Apps



Intelligent learning and training apps for the iPad.
We build kids-friendly, ad-free, privacy-friendly learning apps for school kids. All our apps feature:
  • problems that can be solved step-by-step;
  • immediate feedback for each correct/incorrect steps;
  • intelligent next-step help and error correction;
  • unlimited number of (randomised) exercises;
  • multiple levels of difficulty; and
  • multi-lingual support (at least, in English, French, and German).
All apps are vailable for iPad tablets, from iOS8 onwards.


Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Digit Squares

Number Wheels


Privacy Policy

Our privacy policy is rather simple. We do not collect any information from you and your child when using our app or browsing our website.

You or your child will never be prompted to provide any sort of information in our app. You are free to use the contact form on the website to give us your feedback, ask questions, elicit new app features, or file a bug report. For this, you can equally contact us at

We will use your contact information only for being able to reply to your requests. It will not be shared with anybody else.

Our app is solely financed by its price tag, there are no in-app purchases, and the app is ads-free.


Contact Us

Please use the following form for questions, feedback, feature requests etc.

Our email:

Postal Address

Dr. Claus Zinn, Diplom-Informatiker (Univ.)
In der Gebhardsoesch 33
78467 Konstanz, Germany