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Eight instruments we built for our own quoting and audit work and then published. Each one returns its answer on the page, before it asks you for anything, because a number held back until you hand over an email address is a sales form wearing a calculator.

What each one does

No gate

Why does none of them ask for an email?

Every one of these answers before it asks for anything, and none of them keeps what you type. We would rather be the page that told you the number for free than the page that held it back, because a reader who can check our figure against somebody else's is a reader who can tell we did not invent it.

They are also the instruments we actually use. The audit runs the same nine checks we run before quoting any project, and the calculators read their brackets straight out of the file that renders the price list, so a price we change there changes here on the same deploy.