What happens to what you type
The tools are plain JavaScript inside the page. The text and the numbers you enter are worked out in your own browser, and are never sent to a server, stored or logged. Close the tab and it is gone.
What the site records
The visit itself: which page was opened and roughly where the visit came from. Nothing that identifies you, no profiles, and nothing sold to anyone.
Cookies and advertising
There are no cookies of our own. When the catalogue is complete and the site has real visitors, advertising will cover the cost of running it; if advertising cookies appear, this page will say so and the choice will be yours.
Contact
Questions about any of this: write to the address on the about page.