Contact

The fastest way to reach us is email:

hello@kdp.cool

We read everything — bug reports, feature requests, tool suggestions, and corrections to math or reference data are all welcome. Replies usually within a few days.

Found a bug?

Email hello@kdp.cool with the page URL, what you entered, what you expected, and what you got. Screenshots help.

Looking for a tool we don't have?

Email hello@kdp.cool. We prioritize tools that have a clear job, sources we can cite, and behavior we can show on the page.

What to include

If you are reporting a bug, include the exact page URL, your browser, the input that produced the issue, and the result you expected. If the issue involves a calculator or converter, include the units, dates, rates, or assumptions you used so we can reproduce the same result.

If you are suggesting a new tool, describe the job it should help with, who would use it, and what a correct result looks like. We prefer focused tools with transparent behavior over broad tools that hide important assumptions.

Privacy note

Please do not send passwords, private keys, bank records, tax documents, customer data, or other sensitive personal information. If a screenshot is useful, redact anything private before sharing it by email.