Legal notice and privacy

Last updated: 2026-10-19

1 · Site owner

This website is published by the person identified below, as required by Spanish Law 34/2002 (LSSI, art. 10). Contact by e-mail is the direct and effective channel.

Owner details pending publication.

2 · What Einstein–Hilbert Explorer is

Einstein–Hilbert Explorer is a free-to-use, educational tool for understanding the exact solutions of General Relativity. Visuals marked EXACT are computed in your browser from the genuine equations, in geometric units; visuals marked ANALOGY are illustrations whose limits are stated next to them. It is meant for learning and exploring, not as a research-grade simulation, and it is provided “as is”, without warranty of any kind.

3 · Intellectual property

The software (source code, texts and graphics) is protected by copyright. All rights reserved. The code is served readable to your browser so that the app can run; that does not grant any licence to copy, modify or redistribute it. Einstein–Hilbert Explorer includes no third-party components: it uses the typefaces already on your device.

4 · Privacy

No cookies, no analytics, no trackers. The site does not load third-party scripts.
Nothing stored in your browser. The app keeps no data on your device between visits.
Hosting logs. The hosting provider (Cloudflare) processes connection data (IP address, user agent, requested URLs) to deliver and protect the site, acting as data processor; the owner does not consolidate or exploit those logs.
Outbound links. The donation page (Ko-fi) opens on its own site, governed by its own privacy policy.
Your rights. You may request access, rectification or erasure of any personal data by e-mail to the owner, and lodge a complaint with the Spanish Data Protection Agency (AEPD).

5 · Donations

Supporting Einstein–Hilbert Explorer is voluntary and is not a purchase: it does not create any obligation of service, support or new features. Donations are processed by the donation platform; Einstein–Hilbert Explorer does not receive your payment details.