Corrections

Every correction is checked against the tool's engine and sources. A good report lets the problem be reproduced in a minute.

State the tool and the full page address, the exact value you entered, the result you got and the result you expected, with its source if you have one.

Do not paste passwords, documents, health data or any sensitive input. Always use the smallest example that reproduces the error.

Accessibility reports and computation errors take priority over new-tool suggestions.

All formulas, definitions, and computation sources are public and audited against official standards for each discipline.