Contact

Email [CONTACT EMAIL]. It is read by a person, usually within [RESPONSE TIME].

Worth writing about

• An explainer that is wrong. Send the link and say what is wrong with it. Incorrect maths is the most useful thing anyone can report, and it is what decides which calculators get written next.
• Something that should not be public. Send the link. We will take it down.
• Delete my data. Send the link to the explainer. Because there are no accounts, the link is the only way we can identify what is yours.
• A security problem. Write to [SECURITY EMAIL] and please give us a reasonable chance to fix it before telling anyone else. We will confirm receipt and tell you when it is fixed.

What this address is not

There is no support contract, no phone number and no guaranteed response. This is a small service run by [OPERATOR LEGAL NAME], and the honest thing to say is that a reply is a courtesy rather than an entitlement — except where the law says otherwise, in which case it is not.