Contact
Found a mistake, want a new tool, or have a question? Send an email.
What to write about
A result that looks wrong. Tell me which tool, what you entered and what you expected. With those three details a problem is usually quick to find and fix.
A tool you would like. Describe the question you are trying to answer. Ideas that come from a real task are the ones most likely to get built.
A correction to a rate, date or rule. If a source I use has changed, a link to the official page helps.
Privacy or data questions. See the privacy policy first, then write if your question is not answered there.
Anything else. Business enquiries and feedback are welcome too.
What to expect
This site is run by one person, so replies can take a few days. I try to read every message. I cannot give financial, legal or tax advice, and I cannot check individual invoices or contracts.