Privacy & cookies

1. Calculator inputs

Calculator inputs (dimensions, quantities, densities) are sent to the SteelNomic calculation service to produce results. They are not linked to your identity and are not stored in our database. Do not enter confidential project identifiers into calculators.

2. Contact and feedback messages

When you use the feedback form, your name, email address, topic, related page and message are stored in our Cloudflare D1 database so we can reply. A one-way, salted hash of your IP address is stored to limit abuse (maximum five messages per hour); the IP address itself is not stored. Cloudflare Turnstile is used to block automated spam. Messages may also be forwarded to our inbox by an email delivery service.

2a. Email updates

If you subscribe, we store your email address, the topics you chose, the date and page where you subscribed, the consent wording you agreed to, and a salted hash of your IP address (used only to stop abuse). Your subscription starts only after you click the confirmation link we email you. Emails are delivered by our email provider, Resend, which processes your address only to deliver them. We never sell or share your address and never add anyone who did not subscribe themselves. Every email has a one-click unsubscribe link and a link to change your topics. To have your address deleted completely, use the contact form.

3. Analytics

Google Analytics 4 is optional and is loaded only after you click Accept analytics. You can change your choice at any time using Cookie preferences in the footer. The site works fully without analytics.

4. Local storage

Your analytics choice and game best scores are kept in your own browser's local storage and are never sent to us.

5. Hosting

The site is hosted on Cloudflare, which processes connection data such as IP addresses for security and delivery.

6. Retention and requests

Messages are kept only as long as needed to respond and are then archived or deleted. To ask about or delete your data, use the contact form.

Last updated: 14 November 2026. This policy is general information and should be reviewed against applicable law before any paid service is offered.