Check 1
Fails
Fee load
How much of the sale price never reaches you?
Rolls up to Unit economics
How it works
Three inputs, a full profit and loss statement, seven checks, one ruling.
No account, no Amazon connection and nothing to install. Everything below is a real run on a real product, in Germany, priced from Amazon’s published 2026 rate card — the same run the home page shows.
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1
You describe the product
Marketplace, Amazon category, selling price, unit cost, weight and box. Anything you leave blank is filled with a conservative default and labelled as assumed on the line it affects — never silently.
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2
Every cost is priced from the published tables
Referral rate for that exact category in that exact marketplace, the fulfilment band for that size and weight, storage, returns, duty and VAT. Not an average, not a rule of thumb — the row Amazon publishes for your product.
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3
Seven checks run against the result
Each one asks a different question about the same product, and each returns a band rather than an opinion.
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4
The failures are grouped by root cause
Four of the seven checks sit downstream of margin. Counting them separately turns one problem into four and produces a verdict far harsher than the product deserves, so they are grouped first and counted second.
Step 2, shown: where a €24.90 sale actually goes
Amazon Device Accessories, Germany, 400 g, 30 × 20 × 4 cm, €6.00 unit cost. VAT comes off first, because contribution is always calculated on the VAT-exclusive price.
Net price after VAT€20.92
Amazon referral fee−€11.21
FBA fulfilment−€3.35
Storage−€0.01
Returns−€0.17
Cost of goods−€6.00
Import duty−€0.12
What is left€0.07
Gross price €24.90 including VAT at 19%.
Step 3, shown: the seven checks on that product
These are the real bands returned by the run above — not an illustration of what a check looks like.
Check 2
Passes
Price structure
Is the price sitting inside a band where Amazon’s own fee structure punishes it?
Rolls up to Price structure
Check 3
Fails
Return on inventory investment (annual)
How hard is the cash working over a year?
Rolls up to Capital efficiency
Check 4
Warning
True cost of returns
What do returns really cost once the unsellable ones are counted?
Rolls up to Product risk
Check 5
Warning
Launch advertising burn (% of initial inventory investment)
How much of the opening stock budget goes on advertising to launch it?
Rolls up to Demand & advertising
Check 6
Warning
Price-war headroom
How far can the price fall before it stops working?
Rolls up to Unit economics
Check 7
Passes
Replication risk and the 1P vendor shadow
How easily can this be copied — and would Amazon rather buy it from you as a 1P vendor?
Rolls up to Product risk
Step 4, shown: how those bands become one word
The seven checks collapse into five root causes. The verdict counts causes, never checks.
No cause failsLaunch
One cause failsLaunch with conditions
Two causes failRestructure
Three or more, or any single severe failureDon’t
Price structure is the only failing causeFix your price first
Any check could not be evaluatedDon’t — not priceable
That last row matters more than it looks. If a cost cannot be priced from a published table, the product does not get a clearance by default — a missing number is never treated as a good number. The result for this product was Don't.
What it deliberately will not do
Predict what happens to you
The output attaches to a mechanism, never to an outcome: fails this check, because of this, and this is what changes it. Nobody can honestly tell you what your product will earn, and a tool that pretends otherwise is worth less, not more.
Ask for your Amazon account
Nothing to connect and nothing to authorise, which is why an answer arrives before you have a listing, a supplier or a unit in a box — and why your figures never leave your browser.
Hide an assumption
Every figure that was assumed rather than known is labelled on the line it affects, and marketplaces whose benchmarks are not calibrated say so next to the verdict, not in a footnote.
Run the same four steps on your product
Free, across 11 marketplaces and every published category. No card and no trial clock.