Privacy Policy

1. Privacy at a Glance

All project dimensions, volumes, and prices entered into our calculators are processed 100% locally in your browser. We do not use advertising trackers, third-party cookies, or external font/CDN servers.

2. Controller

3. Hosting (Hetzner Germany) & Server Log Files

This site is hosted on servers operated by Hetzner Online GmbH in Germany (Nuremberg data center, GDPR Art. 28 data processing agreement, no third-country transfers). When visiting this site, our web server processes standard technical request data (anonymized IP, timestamp, requested URL, user agent) based on legitimate interest in secure operation (Art. 6 (1) (f) GDPR). Theme preferences are stored locally in your browser's localStorage.

4. Cookieless First-Party Analytics (Matomo Opt-Out)

We use a self-hosted, cookieless Matomo instance (matomo.heimseiten.com) with IP anonymization and Do-Not-Track (DNT) compliance to understand aggregate page usage. You can opt out at any time using the toggle below:

5. Your Data Protection Rights

Under the GDPR, you have the right to request access, rectification, erasure, or restriction of personal data, as well as the right to lodge a complaint with a supervisory authority.