Our work

Seven accounts, and what changed

Written the way we would explain them on a call: what was broken, what we changed, what it earned, and the part of each engagement that did not work.

Every engagement, filed by service

Seven brands across seven categories. Ad spend at the start ranged from about $5,400 a month to $18,400, which is the size of account we are built for.

Health & Household

Volara Nutrition

Cutting ACoS by 31% while revenue grew 68%

Ad spend was up 40% year over year and profit was flat. We found out why in the first fortnight.

  • +68% Revenue, year over year
  • 31% Lower ACoS
  • Amazon Advertising
  • Account Audits
  • Creative Services
Read the story

Home & Kitchen

Ironvale Kitchen

Surviving Q4 without going out of stock

A cookware brand that kept selling out of the wrong sizes every fourth quarter.

  • +61% Q4 revenue vs prior year
  • 0 Days out of stock on hero SKUs
  • Creative Services
  • Amazon Advertising
  • Account Audits
Read the story

Sports & Outdoors

Bracken Field Outfitters

Taking a one channel brand onto three more shelves

Strong on Amazon, invisible everywhere else. We took the playbook to three more retailers.

  • 31% Of revenue now outside Amazon
  • +34% Total marketplace revenue
  • DSP & Retail Media
  • Amazon Advertising
  • Creative Services
Read the story

Pet Supplies

Bramblewood Pet Co.

Recovering $9,400 in fees, then fixing what caused it

The audit found $9,400 Amazon owed them. That was the least valuable thing it found.

  • $9.4k Recovered in FBA reimbursements
  • +7pt Gross margin on the subscription range
  • Account Audits
  • Amazon Advertising
  • Creative Services
Read the story

Office Products

Halvard Supply

From zero to $34k a month in five launches

A Shopify brand with no Amazon presence at all. We launched four products, not nineteen.

  • $34k Monthly revenue by month five
  • 11wk To the first profitable month
  • Amazon Advertising
  • Creative Services
Read the story

Baby

Ottersey

Nine days to reinstatement, then the actual fix

Their best listing was suppressed on a Tuesday. The variation structure underneath it was the real problem.

  • 9 days To reinstatement
  • +41% Revenue after the variation merge
  • Account Audits
  • Creative Services
  • Amazon Advertising
Read the story

Grocery

Fernbrook Coffee

When the right answer is to stop advertising

We turned their advertising off on two products. Revenue on both held.

  • +22% Contribution margin
  • 58% Of revenue on subscription
  • Account Audits
  • Amazon Advertising
Read the story

Figures come from client Seller Central and advertising accounts over the periods described. Several clients are covered by confidentiality agreements and are not published here. We can usually walk through those on a call.

What they said
afterwards

Sentinel Digital has grown through word of mouth, on the back of what our clients went on to do. Their numbers are the only pitch we have.

Priya Raghunathan

2 reviews · US

★★★★★ 06/04/2026

They told us to stop selling things

Our first month with Sentinel, they came back and said nine of our products were losing money on every unit and we should stop advertising all of them. That is not what an agency paid on ad spend tells you. Nine months on, revenue is up 68% on a smaller catalogue and I finally trust the reporting.

Date of experience:
06/04/2026

Daniel Okoro

1 review · UK

★★★★★ 03/18/2026

First Christmas I did not spend on the phone to freight

We sell cookware, so our year is really six weeks long. Sentinel built the Q4 plan in June and worked backwards from the shipping cutoff. We did not go out of stock for the first time in four years, and our January rank held instead of falling off a cliff.

Date of experience:
03/18/2026

Hannah Vogel

1 review · US

★★★★★ 02/09/2026

Annoying and correct

We had tried Walmart in 2023, done about two grand a month, and written the channel off. Sentinel went back through what we had actually done and showed us we had never run it properly. Nine months later a third of our marketplace revenue is off Amazon. Worth the mild embarrassment.

Date of experience:
02/09/2026

Marcus Feld

1 review · UK

★★★★★ 11/21/2025

The audit paid for itself in week three

We booked a one off audit because our accountant could not reconcile Amazon’s numbers. They found $9,400 in unclaimed reimbursements and a dimension error that had been overcharging us since 2023. Then they read a year of our return comments and worked out our bag was splitting in transit, which was costing us more than the fees were.

Date of experience:
11/21/2025

Jen Castellano

3 reviews · US

★★★★★ 09/30/2025

Weekly call, 25 minutes, actual decisions

I have worked with four agencies and this is the only one where the call ends with a decision rather than a deck. Same five numbers every Tuesday. If something is not working they say so before I have to ask, which sounds like a low bar until you have been on the other kind of call.

Date of experience:
09/30/2025

Tomasz Adamek

1 review · DE

★★★★★ 08/12/2025

Good on the detail, honest when a test fails

They ran a DSP audience for us that did not work and shut it down at about two and a half thousand dollars rather than letting it run to protect the story. The next one returned over 3x. I would rather have an agency that stops things than one that never admits a test went nowhere.

Date of experience:
08/12/2025

Reviews collected from clients at the end of each engagement quarter.

We came to Sentinel after two agencies that both sent beautiful monthly decks and neither of which could tell me what a unit actually earned us. The difference here is that the first conversation was about our cost of goods, not our ad spend. They rebuilt the account around six products instead of twenty four, and the six that mattered got the budget the other eighteen had been quietly eating. I still get a short note every Tuesday telling me what changed and what they are doing about it. Three years of agencies, and that is the thing I would not give up.

Priya Raghunathan VP Growth · Volara Nutrition

Every one of these started as an audit

Two weeks, read only access, and a document you keep whether or not we work together. That is how all seven of these engagements began.