What am I doing wrong? Upload three reports and find out.
Amazon shows you what happened. It will not tell you which part of it was a mistake, which product cannot afford the ads pointed at it, or what to change first. You get the answers as a file you upload straight back into Amazon.
No login and no Amazon account to connect. Your data stays yours: we do not sell it, share it, compare it against anybody else’s, or train anything on it — and nobody here goes looking through it.
the line it was measured against.
What is losing money right now
Which keywords are losing money, and what should the bid be instead?
Which search terms should I kill — and which look terrible but must never be killed?
Am I bidding against myself in two campaigns at once?
What this product can afford
Which product loses money before I spend a penny advertising it?
Am I paying for sales I would have got anyway?
What to do next
Why did my ACOS move, and is it even an ads problem?
Is my launch working, or just spending?
What should each campaign get for Prime Day?
See it on a real account
A whole account, already analysed — every bid with the reasoning behind it, the terms to negate, and the ones that convert and must never be.
Work from your reports
Upload what Amazon already gives you. Get back bid changes, a harvest list, negatives, budget calls and a diagnosis of what moved and why — every one anchored to a real margin.
Sponsored Products Bulk File — current bids,
budgets, and the only link between a campaign and the product it
sells.
Search Term Report — daily rather than summary, so the
diagnosis can compare two periods.
Your unit costs — the one thing Amazon cannot tell us.
Price a single SKU
No files, no account, nothing to download. Type in one product's numbers and find out what it can afford to spend on advertising — and what a click is worth.
Sale price — what a customer pays today,
after any standing coupon.
Landed cost — the unit, plus freight and duty.
FBA fee — from Fee Preview, or the revenue calculator.
The referral fee is looked up for you.
Amazon gives you the numbers. This tells you which of them is a problem.
Every figure below comes out of reports you already have, worked out in plain arithmetic you can audit. Nothing is applied to your account for you, and nothing here is a projection dressed up as a fact.
Money
what a product can actually affordBreakeven ACOS, per product
Price, less landed cost, Amazon's referral fee, fulfilment and anything else variable — as a share of the price. That share is the ceiling: spend more than it advertising a unit and the unit loses money. Every bid in the product is derived from this one number.
A product below zero is flagged loudly. It loses money on every sale before a penny of advertising, and no bid change fixes that.
Where each figure came from
The price you were actually paid, fees from your Fee Preview, landed cost from your own sheet. Each figure is labelled exact, derived or estimated, so you know which numbers to lean on and which to go and check.
Fees are category-correct across all 34 Amazon categories, including the tiered ones that stack rates across bands rather than applying one rate.
A profit and loss that includes your own costs
Storage, a VA, software, freight outside Amazon. None of it appears in any Amazon report, and without it a net profit figure flatters you. A line we were not given is never treated as a zero.
A forecast that admits what it is
Trailing trend and day-of-week shape, shown as a range built from your own week-to-week spread — never a single number. Under eight weeks of data it says the forecast is unreliable and shows it anyway, with that warning attached.
Bids
a number you can type into Seller CentralOne formula, applied everywhere
ACOS is cost per click divided by conversion rate times order value. Rearranged, the most a click can be worth is your target ACOS times conversion times order value. That is the whole of it, and every recommendation shows its working.
Guardrails that do not get tired
No bid derived from under ten clicks. No single move larger than 15%. Never a bid change and a placement change on the same campaign in the same week, because then you cannot tell which one worked.
It knows Amazon charges more than your bid
Dynamic bidding and placement adjustments can take a click well above what you set. The gap between your bid and what you were actually charged is measured per keyword and built into the number it gives you back.
Sponsored Products, Brands and Display
All three read from one upload. A Brands campaign on a lifetime budget is not paced day by day, and a Display campaign charged per thousand views is not given a cost-per-click bid — both are refused out loud rather than answered with a made-up number.
Search terms
what to promote, what to kill, what to leave aloneHarvest, with the other half attached
A term that has proven itself is promoted to exact at a bid derived from its own conversion rate — and negated in the campaign it came from, in the same file. Promote without negating and your two campaigns bid against each other.
It can also build the whole campaign for a harvested term: campaign, ad group, product ad and keyword, ready to upload.
Negation on clicks, never on ACOS
A term is negated when it has taken at least twice the clicks that product normally needs for a sale and made none. A term that converts but costs too much is never negated — it gets its bid cut. Negation throws a real buying signal away for good; a bid cut just reprices it.
The losing word, not just the losing term
Fifty terms wasting three dollars each look like noise one at a time. Split into their component words and rolled up, they usually share a root — free, cheap, a competitor's name — and one negative phrase does the work of fifty negative exacts.
Where you are bidding against yourself
The same keyword live in two campaigns means Amazon enters one of them and you push your own price up, while the evidence splits in two. It names the copy that converts best and what to do with the others — never "delete", because that throws the history away.
Campaigns
four jobs, four different metricsLaunch, Harvest, Scale and Defend do different jobs. Holding all four to one ACOS target strangles launches before they gain rank and overspends on brand defence. Each campaign is classified from its name, its targets and its structure, told what it should and should not be judged on, and the classification can be overridden — which recalculates everything downstream.
Budget, rank and events
the parts nobody has time to do by handBudget pacing that refuses to guess
Spend and days come from the same dated file. With no dates it says so rather than dividing by a number it invented, and it will not report a utilisation Amazon's monthly averaging makes impossible.
Share of search
Brand Analytics is the only free Amazon report that says where you stand against everyone else selling into the same search. It is what lets a launch be judged on rank moving rather than on an ACOS it was never meant to hit.
An event plan for Prime Day
Warm-up, event and cool-down budgets per campaign, derived from breakeven. Scale campaigns are raised only where they are already inside target, launches get a ceiling and a stop condition, and harvest campaigns are held — terms "proven" during an event are proven against a week that will not happen again for a year.
Ninety days, then eighteen months
Amazon keeps about ninety days of search term history — and only sixty on Sponsored Brands and Display — then deletes the rest. Upload weekly with an account and you hold eighteen months, the longest Amazon’s own rules allow anyone to keep it. It is yours: never sold, never shared, never pooled with anybody else’s. Re-uploading a week you already hold changes nothing, so overlapping files are harmless.
Why it moved
the question a report cannot answerACOS can only rise for three reasons: clicks got dearer, fewer of them converted, or orders got smaller. The movement is split between the three and each given its share — per product and per campaign, not just across the account, where the answer is usually "a mix".
If conversion fell while the cost per click held, the problem is your listing and a bid cut makes it worse. That distinction is the whole reason the decomposition exists.
What you get back
three files- An Amazon bulk upload file — bid changes, new keywords and negatives, formatted to go straight back into Bulk Operations, and checked before you get it. This is the one that turns a report into an afternoon's work done.
- A spreadsheet per table — bids, harvest, negatives, budgets, products. For people who want to sort and filter it themselves.
- A PDF of the whole analysis — the profit picture, what needs attention and why, for handing to somebody who is not going to log in. Put your own logo and name on it and ours comes off, which is the version an agency wants.
What it will never do
on purposeFour things this refuses
It will never change your account for you. Every recommendation is yours to approve, ignore or argue with. Nobody hands a black box unsupervised control of real money.
It will never send your raw report rows to a language model. The arithmetic is plain Python on our own machine. The model only ever sees a computed summary, with product identifiers stripped out.
It will never invent a number. Where a figure cannot be worked out honestly, the screen says so and says what is missing — rather than filling the gap with something plausible.
Signed out, it will never keep anything. Your files are read in memory, the report is built, and nothing about your business is written down.
Your account
Everything worked out from your reports, kept so it is still here next week — and kept for you alone. We do not sell it, share it, or pool it with anybody else’s.
On this free tool specifically: your files are read to build the report and the server forgets them — close the tab and it is gone. The one thing kept is a random marker in your browser so the free AI answers cannot be farmed; it carries no name, no email and nothing about what you sell. With an account we do keep your history — that is the whole point of one — and you can delete it whenever you like.
No files needed. Enter one product's numbers and Vantwyn works out what it can afford to spend on advertising — the breakeven ACOS, and the target that leaves your margin intact. The referral fee is looked up from the product's category.
What this means
The anchor
Every bid below traces back to one number per product: the advertising cost at which that product stops making money. Open what if on any row to drag price and cost around and watch the margin move.
Bid recommendations
Every move is capped at 15% of the current bid. A bigger jump makes the result unattributable and forces Amazon's delivery algorithm to relearn the keyword. Click any row for the working.
| Keyword | Job | Bid now | Recommend | Change | ACOS | Target | Breakeven | Data |
|---|
Search terms
Converting but unprofitable is a bid cut, never a negation
Negating a term that converts destroys a real demand signal permanently — you stop seeing it, and if your price or costs improve later you never find out it became profitable. A bid cut only reprices it, and you can cut again next cycle. It is an easy distinction to get backwards, and getting it backwards cannot be undone.
Harvest
Each promotion comes with its negation. Adding the keyword without negating it at source puts two of your own campaigns into the same auction, inflating your CPC and splitting the data across both.
| Search term | From | To | Clicks | Orders | ACOS | New bid | Then |
|---|
Word roots
Fifty terms each wasting three dollars look like noise one at a time. Rolled up by word they usually share one losing root, and a single negative phrase does the work of fifty negative exacts.
| Root | Terms | Clicks | Orders | Spend | Verdict | Seen in |
|---|
Campaign jobs
Campaigns do four different jobs and must be judged on four different metrics. Applying one ACOS target across an account strangles launches and overspends on brand defence.
| Campaign | Job | Judge it on | Spend | ACOS | Target |
|---|
Budget pacing
| Campaign | Budget | Avg spend | Used | ACOS | Verdict |
|---|
Why the numbers moved
What this run could see
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