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Contact

A form that reaches us directly, and an address if you prefer. No ticket number, no chatbot.

Optional, but it helps us answer faster.

The only way we can answer, and used for nothing else.

Your message and your address are stored only to answer you, and are never used for anything else.

Write to us

The form above is the shortest way: it lands in the same inbox, it asks for an address so that we can answer, and it asks for nothing else. It covers a wrong result, a tool that will not load, a suggestion, a legal or privacy request, or anything else. A letter reaches us too, at the address below.

Reporting a wrong calculation

This is the most useful message you can send, and the correction policy says exactly what to put in it: which tool, the values you entered, the result you got, the result you expected, and the source that says so. With those five lines a fix takes minutes; without them it may take nothing at all, because the problem cannot be reproduced.

What will not get a reply

Link exchange offers, guest post proposals, SEO services and unsolicited commercial approaches. Saying so here is more useful than a filter, because it saves you writing the message.