Privacy Policy

In short

• There are no accounts, and we don't ask for your name or any other personal information.
• The site sets no cookies of its own and shows no advertising.
• Simulations run on your device. Your parameters and results are not sent to us.
• We count visits with Cloudflare Web Analytics, which uses no cookies and doesn't track you across sites.
• We don't sell or share personal information.

In this policy, “we” means the operator of xystress.com.

Simulations and settings stay on your device

All calculations run in your browser. The settings of a simulation are part of the page address (so that you can share a link), and files you export, such as CSV data or images, are created on your device. None of this is sent to us.

To remember your choices, the site stores a few preferences in your browser:

• your light or dark theme, and the performance settings (quality, background thread, graphics processor), until you clear the site's data;
• how you last viewed a step-by-step solution, until you close the tab.

These stay in your browser, are never sent to us, and are not cookies.

Visitor statistics

We use Cloudflare Web Analytics to see how many people visit each page, so that we know what is useful. For each visit it records the page, the page you came from, the type of browser, operating system, and device, your country, and how fast the page loaded. It uses no cookies or other storage on your device, doesn't build a profile of you, and doesn't follow you to other sites. We see only totals, not individual visitors.

Hosting and security

The site is delivered by Cloudflare. Like any web server, it receives your IP address and basic information about your browser with each request, and uses them to deliver the pages and to protect the site from abuse and attacks. In rare cases, for example to tell people from automated traffic, Cloudflare may set a strictly necessary security cookie. We don't use this information to identify you. All pages are served over an encrypted connection (HTTPS).

Cloudflare processes this information on our behalf, under the Cloudflare Privacy Policy. Our reason for this processing, and for the statistics above, is our legitimate interest in running a working, secure site and understanding how it is used.

If you email us

When you write to us, we receive your email address and your message. Cloudflare Email Routing forwards it to our mailbox. We use it only to reply to you and to improve the site, we don't share it, and we keep it only as long as we need it for that.

Children

The site is suitable for students of any age, and it doesn't ask anyone for personal information. If a child has emailed us and a parent or guardian would like the message deleted, contact us and we will delete it.

Your choices and rights

• To remove the stored preferences, clear this site's data in your browser settings.
• The site works fully if you block analytics with a content blocker.
• Depending on where you live (for example under the GDPR in Europe, or in California), you may have the right to ask what personal information we hold about you, and to have it corrected or deleted. In practice, the only personal information we could hold is an email you sent us. Contact us for any of these requests.

Changes to this policy

If we change how the site handles information, for example by adding accounts or advertising, we will update this policy before the change goes live, and change the date at the top.

Contact

Questions about privacy: contact [at] xystress.com.