Privacy policy

This is a static website. There are no accounts, no login, no comment forms and no newsletter, so there is nothing here that asks for your name, your email address or any other personal detail.

Calculator inputs

The calculators run entirely in your browser. The numbers you type are never sent to a server, never stored and never shared, because there is no server involved in the arithmetic. Closing the tab discards them.

Analytics

The site uses a privacy-focused analytics script that counts page views without cookies and without building a profile of individual visitors. It records the page requested, the referring site and coarse technical details such as country and device type. It does not follow you to other websites.

Third parties

Outbound links to sources such as grading companies and marketplaces are ordinary links; those sites have their own policies once you arrive. The site is hosted on a content delivery network, which processes request logs to serve pages and defend against abuse.

Changes

Any change to this policy will appear on this page. Continued use of the site after a change means the updated policy applies. The terms page covers how the material on the site may be used, and the about page explains where its facts come from.