Privacy Policy

1. Controller

The controller within the meaning of the GDPR is the operator named in the Impressum.

2. Hosting & server logs

This site is served as static files. The hosting provider processes technical log data (IP address, timestamp, requested URL, referrer, user agent) to deliver and secure the site. Legal basis: Art. 6 (1) (f) GDPR, legitimate interest in a secure, functioning service. Logs are deleted after a short retention period.

3. No cookies, no tracking

This site sets no cookies and embeds no third-party analytics, fonts, maps, or social widgets. No profiling takes place.

4. Voluntary support

Buy Me a Coffee

We offer the option to support this project via Buy Me a Coffee. The provider of this service is Publisher Media LLC, 548 Market St, PMB 69533, San Francisco, CA 94104, USA.

The integration on our site is a pure external link. We load the button image locally from our own server. Absolutely no data flows to Buy Me a Coffee when you visit our page.

When you click the button, you leave our site. You are redirected directly to the provider’s servers. Only then does the provider collect data like your IP address or payment details. We have no access to this data. We never store payment information on our own infrastructure.

This link is based on our legitimate interest in the voluntary financing of this project (Art. 6 (1) (f) GDPR). You can find details regarding their privacy practices in the Buy Me a Coffee privacy policy: https://www.buymeacoffee.com/privacy-policy.

Kinderhaus Weimar

We link to the donation page of Kinderhaus Weimar (kinderhaus-weimar.de/spenden/). This is a pure external link. No data flows to Kinderhaus Weimar when you visit our page. When you click the link, you leave our site and are subject to the privacy policy of the respective website operator.

5. Related projects

This website is part of a family of free browser-based tools by the same developer. All projects share the same privacy-first architecture:

• PatioPlanner — Paving area planner. All calculations run client-side. Project data stays in Local Storage.
• HTML to Markdown AI — Bulk HTML to Markdown converter. Zero network requests after page load. All file processing happens locally via WebAssembly. No uploads, no telemetry, no cookies.
• How To Lose Money Fast — Lottery simulator and analysis tool. All calculations run client-side.
• DruckZugPro — Chimney cross-section pre-check calculator per DIN EN 13384-1.
• My Blog — Homelab, self-hosting and other technical projects.

None of these services share data between each other or with third parties.

6. Contact by email

If you contact the operator by email, the data you send (email address, message content) is processed solely to handle your request (Art. 6 (1) (b) / (f) GDPR) and is erased once it is no longer required.

7. Your rights

You have the right to access, rectification, erasure, restriction of processing, data portability, and objection (Art. 15–21 GDPR), and the right to lodge a complaint with a supervisory authority.

8. Contact

For any data-protection request, use the contact details in the Impressum.