Price is your biggest profit lever — and most people set it by gut. This computes your real margin, gross profit per unit, and the exact break-even volume shift for a price change, then reasons whether you're under- or over-priced and the move to test.
The break-even volume math is exact. Whether demand holds at a new price is something you test.
Every account gets one free run, then it's 1 credit each (free monthly credits cover normal use).
It doesn't predict sales — it can't know your price elasticity. What it computes exactly is the break-even volume math: how much volume you could afford to lose on a price rise, or must gain on a cut, to hold profit. That arithmetic plus your margin is usually enough to see whether a price move is worth testing. Whether demand holds is something you test.
Because a price change goes straight to profit, a rise means you can sell somewhat fewer units and still make the same money, and a cut means you must sell many more. The tool shows the exact percentage for ±10% and ±20% moves — it's often eye-opening how little room a discount leaves.
Either your unit cost or your gross margin % works — one implies the other given your price. The more accurate that is, the sharper the diagnosis.