What this site measures, and what it doesn’t.

What this site doesn't do

There are no ads, no trackers from other companies and no Google Analytics. No cookies are set. The fonts are on the same server as the site, so those don't send a request to another company either. Your theme choice is kept in your browser's local storage and never leaves your device.

Visitor statistics with Umami

To see how the site is doing, which pages and tools are useful and what could be better, I use Umami: open-source software for visitor statistics. Umami runs on a server I manage myself. Nothing goes to Google or any other company.

For each page view it records: which page, the website you came from, the type of browser, operating system and device, the screen size, your browser language, and the country, region and city. That location is derived from your IP address; the IP address itself is not stored.

To avoid counting visits twice, Umami makes a random code from your IP address, browser and a secret value that changes every day. That means I can recognise a visit for one day at most, and can’t see who you are. No profiles are built and nothing is linked to other websites.

What you type into a tool never ends up in the statistics: Umami only gets the page address, without the parameters after it.

I only use this to make the site and the tools better, based on my legitimate interest. The data isn’t sold, isn’t shared and isn’t used for advertising. Because no cookies are set and you can’t be identified, no cookie notice is needed.

Switching statistics off

If your browser sends a Do Not Track or Global Privacy Control signal, Umami isn’t even loaded. You can also switch it off below: that is only remembered in this browser.

Server logs

Like almost every web server, the server for this site can log technical details of a request, such as your IP address, the page requested and the time. I only use that to find faults and abuse.

[PLACEHOLDER: how long server logs are kept]

The tools

What you enter in a tool stays in your browser and isn't stored. One exception: the e-mail check looks up public DNS records through Quad9, a public DNS service run by a Swiss non-profit foundation. Quad9 then sees the domain you check, and handles your IP address under its privacy policy. I see none of it.

Quad9's privacy policy

If you e-mail me

Then I see your address and what you write. I only use that to reply to you.

Questions

This site belongs to Calvin van der Zijde. Want to know what data I have about you, or want it deleted? E-mail me.