Contact

Write to admin@toin.app. It reaches the person who maintains the tools directly.

Reporting a wrong result

If a calculator gives an answer you believe is wrong, please include the exact values you entered, what you expected, and which page you were on. Date bugs almost always depend on the specific dates involved, so those details are what let us reproduce and fix it.

Suggesting a tool

Which tools get built next is decided partly by what people ask for. If something you need is missing, tell us what you were trying to work out — the underlying task is more useful to us than the name of a feature.

Privacy and data requests

Requests under the GDPR or the Brazilian LGPD go to the same address. See the privacy policy for what we do and do not collect — which, for the calculators themselves, is nothing.