Method Services Work Fit Free tools FAQ Get the audit

Where does your next ad dollar stop paying?

Upload your spend and revenue history. It fits a curve to your own numbers and shows what the next dollar returns against break-even.

  • Fitted to your spend history, not a benchmark
  • Marginal return on the next dollar, against break-even
  • The point where more spend buys demand you already had
  • Nothing leaves your browser

Free. We will not pass your details to anyone, and you can unsubscribe in one click.

The Incrementality Curve
Your own data, fitted. Nothing is uploaded anywhere.

Blended ROAS hides where the money stops working.

An average tells you nothing about the last dollar you spent, which is the only one the next decision is about.

What usually happens

Spend rises, blended ROAS holds, and it looks fine. The average is being propped up by the efficient spend underneath it.

Why it keeps happening

Nobody separates average return from marginal return. The last dollar can be under break-even for weeks while the headline number still looks healthy.

The only number that matters is the marginal one.

Fit the curve to your own history and you can see the point past which more budget stops buying anything new.

What it works out from your data.

Everything happens in the browser. Your file never leaves the machine.

01

Drop in your history

Daily spend and revenue, straight from the platform.

02

It fits the curve

A diminishing returns model against your own numbers.

03

Read the marginal return

What the next dollar does, against break-even.

04

Find the saturation point

Where more spend stops buying incremental revenue.

Get the curve.

Free, and yours to keep. If you want us to run this alongside a full account read, the audit does that.

Open the curve →
© 2026 Something New. Auckland, New Zealand. somethingnew.co.nz