Privacy policy
Last updated: 2026-10-07
2. Overview
This website presents our free learning apps. It uses no cookies, no analytics, no advertising, no social media plugins and no external fonts or scripts. All files are loaded from the same server.
3. Hosting on GitHub Pages
This website is hosted by GitHub Pages, a service of GitHub, Inc., 88 Colin P. Kelly Jr. Street, San Francisco, CA 94107, USA. When you visit the website, GitHub automatically processes technical access data (server log files), in particular your IP address, the date and time of access, the page requested and browser information. This is necessary to deliver the website securely and to defend against attacks.
Legal basis is Art. 6(1)(f) GDPR; our legitimate interest is the secure and reliable provision of this website. Data may be transferred to the USA. GitHub states that it participates in the EU–U.S. Data Privacy Framework; transfers are therefore based on an adequacy decision of the European Commission (Art. 45 GDPR). We have no access to these log files. More information: GitHub Privacy Statement.
4. Contact by email
If you write to us by email, we process your email address and the content of your message only to answer your request. Legal basis is Art. 6(1)(b) GDPR (if your request relates to a contract) or Art. 6(1)(f) GDPR (our legitimate interest in answering enquiries). We delete the data when it is no longer needed, unless statutory retention obligations apply.
5. Links to Google Play, the App Store and GitHub
Links to Google Play, the App Store and GitHub are ordinary links. Data is only transferred to these services when you click such a link; their privacy policies then apply.
6. Our apps
Our apps do not collect any personal data. Details are described in the privacy policy of each app:
7. Your rights
You have the right to access (Art. 15 GDPR), rectification (Art. 16), erasure (Art. 17), restriction of processing (Art. 18), data portability (Art. 20) and to object to processing based on Art. 6(1)(f) GDPR (Art. 21). To exercise your rights, simply contact us by email.
You also have the right to lodge a complaint with a data protection supervisory authority, for example the authority responsible for us: Landesbeauftragte für Datenschutz und Informationsfreiheit Nordrhein-Westfalen (LDI NRW), Kavalleriestraße 2–4, 40213 Düsseldorf, Germany.
8. Changes
We update this privacy policy when the website or legal requirements change. The current version is always available on this page.