Terms of use

What you get. Calculators and checkers that run in your browser, free to use, with their method and their sources written on each page.

What they are not. A result is a computation from what you typed, not advice. Each page states what its tool cannot know; read that paragraph before relying on a figure for a network, a server or a purchase.

No warranty. The tools are provided as they are. Every tool ships a self-test you can run on the page; a result that matters should still be checked against the device or document that will carry it.

Changes. A tool's method carries a version and a date; when the method changes, the version changes with it.