Design partner program

Your ads, measured against the only number that can't lie: your own orders.

Plumbline is taking on 10 design partner stores before opening up more widely. Free for 3 months, full access at whatever level your data supports, and the founder on call. In exchange: your candid feedback, and a willingness to actually try a recommendation.

The window closes when 10 slots fill

The problem

Ad platforms grade their own homework. Add up their dashboards and you get more sales than your store actually had. In a 2024 survey of US marketers, only about 1 in 5 said last click attribution reasonably reflects a platform's real long term impact, and 3 in 4 were moving away from it or wanted to. A 2025 survey of more than 700 app marketing leaders found only 18 percent trust their attribution data. Budgets get set on those numbers anyway.

Sources: EMARKETER and Snap, Media Measurement Survey, September 2024; Branch and GlobalSurveyz, 2025 State of App Growth Report.

What Plumbline does

1 · THE HONEST SCOREBOARD

Real numbers, side by side

Real revenue, real spend, and each platform's claims next to what your orders actually support. Pure accounting, no modeling.

2 · THE MEASUREMENT

Error bars included

What each channel returns per extra dollar, with real uncertainty, estimated from your own history.

3 · THE DECISION

A move, or an honest hold

A concrete weekly budget move, sized by the odds it helps, or an honest "hold, do nothing this week."

What makes it different: every number ships with its uncertainty. Tiers unlock only when your data can support what they sell. When the answer is unknowable, Plumbline says so and prescribes what would make it knowable. No number without its error bar, no tier you can buy until your data supports it.

The deal

What you get

  • Free for 3 months, full access at whatever level your data unlocks
  • The founder on call, not a support queue
  • Then $39, $129, or $299 monthly if you stay. Cancel anytime.
  • Read-only connections. Plumbline never touches your campaigns or your store.

What we ask

  • Connect Shopify and your ad platforms, read-only
  • Try at least one recommended budget move, from a checklist we prepare
  • A 30 minute call every 2 to 3 weeks
  • Candid feedback, especially where the product falls short

Regional holdout experiments are invited for stores whose volume can support one, never required.

What we promise, honestly. Numbers with real uncertainty attached. A product that says "we can't tell yet, and here's how to fix it" instead of inventing confidence. Direct access to the person who built it. What we don't promise: that your data will unlock every tier immediately. If it can't support an answer yet, Plumbline will tell you that too. That's the point.

Worth a 20 minute look at your numbers?

A good fit is a Shopify store spending on 2 or more of Google, Meta, and TikTok, with the person who touches ad budgets in the room. If that's you, write and we'll set it up.

support@plumblinelabs.com