Privacy notice

Short version: no cookies of our own, no advertising or cross-site trackers, no IP addresses in our logs. We count visits in aggregate with Cloudflare Web Analytics, which sets no cookies. Calculator settings stay on your device.

What we collect

• Server logs. For each request: the time, page, response status, the country reported by our network provider and the referring website's domain. We do not store IP addresses. Logs are kept for up to 12 months to keep the site running and to see which pages are useful.
• Contact form. Your message, topic, optional email address and the page language. We use it only to reply and keep it for up to 12 months.

Service providers

The site is delivered through Cloudflare, which processes technical data such as IP addresses to deliver pages and protect the site, and may set a strictly necessary security cookie. To see how many people read which pages we use Cloudflare Web Analytics: a small script that sets no cookies, stores nothing in your browser and does not fingerprint visitors. It gives us only aggregate figures such as page views, referring websites, countries and device types. We use no advertising or social-media services.

Your rights

You can ask what we hold about you, and ask us to correct or delete it, through the contact page. You may also complain to your data-protection authority.