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Questions about a tool, a result that looks wrong, an accessibility problem, or an idea for something we should build next — all of it is welcome. Reports of incorrect results are the most useful thing you can send, so please include the inputs you used.
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Before you write about a result
Every tool page lists its assumptions and limitations below the tool itself. A result that disagrees with a textbook is often a modelling assumption rather than a defect, and those sections usually say which one. If the assumptions do not explain it, we want to hear about it.
What we cannot help with
We cannot check homework, review designs, or approve calculations for consequential use. See theengineering disclaimer for what these tools are and are not suitable for.