About

A plumb line is the oldest way to find true vertical. We'll build one for your numbers.

For four thousand years, a weight on a string has told builders what’s actually straight. Plumb does the same for spend and revenue. One honest reference the whole business can build on.

Why we exist

We got tired of arguing about whose number was right.

We spent years on the operator side of subscription businesses — accountable for CAC, LTV, and the budget behind them. Every morning started the same way: pulling numbers out of a slow BI tool and stitching three dashboards together just to see where we stood.

And once the picture was assembled, the arguing began. Marketing’s ROI, finance’s ROI, the platforms’ ROI — none agreeing, and a decision due anyway. Spend and revenue lived on opposite sides of a wall, and no one owned the seam. So every meeting relitigated the same question: which number do we believe?

Plumb is what we wanted back then — not one more dashboard to check, but a team that builds the number for you and keeps it honest. You don’t log in to assemble the picture. We hand you the answer.

What we believe

Four things we won’t compromise on.

01

Correct beats fast.

A number that’s wrong at speed is worse than no number. We would rather make you wait a day than hand you a figure that falls apart under scrutiny.

02

One definition, or none.

“Return” has to mean the same thing everywhere before any comparison is honest. We hold every channel to a single definition — the one your business actually runs on.

03

Built for you, not templated.

No two businesses reconcile the same way. We architect around how yours actually works instead of bending you to fit a product we shipped for someone else.

04

We stay on the hook.

We monitor your data around the clock and tell you when something moves. The relationship doesn’t end at onboarding — that’s where it starts.

Find true vertical for your numbers.

Book 30 minutes and we’ll reconcile your own spend and revenue live.

Talk to the team