Privacy

What we collect. We do not ask you to register and we do not set our own cookies. If you send a report through “Report an issue”, we store the page, your message and the optional username you typed. We also keep a one-way scrambled form of your connection address for a short anti-spam rate limit; the real address is not stored.

Remembered setting. Your “Show the maths” choice is stored in your own browser (local storage) and never sent to us.

Statistics. We use privacy-friendly page-view statistics that do not use cookies and do not identify you.

Advertising. The site is supported by ads. When ads are shown, Google and its partners may use cookies or similar technology to show and measure ads, and, where required, only after you give consent. You can manage personalised ads in Google’s ad settings.

Contact. Questions about privacy: see the contact page.