What this site stores, and why

Plain language, no tricks. This is a private, non-commercial project.

Who is responsible

Karsten Eckhardt runs this site as a private person. Questions or requests: karsten.eckhardt@gmail.com

What is stored

• A random ID your browser creates on your first visit. It identifies this browser, not you (pseudonymous).
• Your answers to the test questions and how long each one took.
• Your self-ratings and predictions from before the test.
• The optional details about you (age band, gender, work background, education, country), if you give them.
• Where you first came from: the website that sent you (domain only), the campaign tag in the link, the first page you opened, plus a coarse device class (phone, tablet or desktop).
• The steps you take (for example which version you picked), which share buttons you tap, and whether someone arrived through a link you shared.

What is not stored

No names, no email addresses, no IP addresses. No ads, no third-party trackers or analytics. The random ID lives in your browser's local storage, not in a cookie. The only cookie remembers your language, and it is set only when you switch languages.

What it's used for

To show you your results, and for non-commercial research by the site owner that replicates the published studies, for example how self-ratings relate to test scores. Aggregated results may be published. Nothing is sold or used for advertising.

Legal basis

Legitimate interest (Art. 6(1)(f) GDPR) in running the test and in non-commercial research. Taking part is voluntary, and you can delete your data at any time.

Where it is stored

On a virtual server rented from Hetzner in Germany and run with Coolify. Encrypted nightly backups go to a Hetzner Storage Box in the EU.

How long

Until you delete it, or until the project ends. Backups are kept for up to six months, so deleted data is gone from them within six months.

Deleting your data

On your progress page, "Delete my data" removes everything stored about this browser, on the server and on your device. Under the GDPR you can also ask for access or correction, and complain to a data protection authority.