Privacy Policy

Last updated: October 7, 2026

This policy explains what information Graphium3D ("we", "us") collects when you use this website, and how it is used. In short:we do not ask you to create an account and we do not collect your name, email or other personal details unless you choose to contact us.

Information stored in your browser

The site uses your browser's local storage to remember your colour theme (light or dark), whether you use Lite mode, which topics you have marked as "learned", your lesson-quiz and practice-test scores, and the days you studied (for your streak).This information never leaves your device. You can clear it at any time from your browser settings.

Advertising and cookies

Graphium3D is free because it shows advertisements served by Google AdSense. Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this website or other websites. Google's use of advertising cookies enables it and its partners to serve ads to you based on your visits to this site and/or other sites on the Internet.

• You may opt out of personalised advertising by visitingGoogle Ads Settings.
• You can also opt out of some third-party vendors' use of cookies for personalised advertising atwww.aboutads.info.
• Learn more abouthow Google uses information from sites that use its services.

Visitors from the European Economic Area, the United Kingdom and Switzerland are asked for consent before personalised ads are shown, using Google's consent message.

Analytics

To understand which lessons are useful and improve the site, we may use Google Analytics and/orCloudflare Web Analytics. They collect anonymous usage information such as pages visited, approximate country, device type, and interactions like playing a 3D model, sharing a link or finishing a quiz. Cloudflare Web Analytics does not use cookies. Google Analytics may use cookies; in the EEA, UK and Switzerland they are only set after you give consent. You can opt out of Google Analytics with theGoogle Analytics opt-out browser add-on.

Contact form and mistake reports

When you send a message through the contact form or the "Report a mistake" button, we receive what you type, the e-mail address you give (optional for reports), the page you were on, a link to the step of the 3D model you were viewing, and your browser type and screen size. Messages are delivered to our inbox by a form-forwarding service and are used only to reply to you and to fix the lesson. Sending a message never adds you to a mailing list.

Log data

Like most websites, our hosting provider may automatically record standard technical information such as your IP address, browser type and the pages you visit. This is used only to keep the site secure and working.

Children

Graphium3D is a general learning website and is not directed at children under 13. We do not knowingly collect personal information from children.

External links

Our pages may link to other websites. We are not responsible for the privacy practices of those sites.

Changes to this policy

We may update this policy from time to time. The "last updated" date at the top shows when it was last changed.

Contact

Questions about this policy? Email[email protected].