FEATURES
The Amazon Barcode Scanner That Tells You What the Numbers Mean
You are standing in an aisle holding a product. You have maybe five seconds to decide whether it is worth buying. The AskJeffy scanner, now live on iPhone and iPad, answers that question with the numbers that actually decide it: the most you can pay, whether the thing sells, who you would be competing against, and whether the price is about to collapse.
What a sourcing decision actually needs
Retail arbitrage and wholesale sellers do not read a screen the way a private label seller does. There is no time. You are in a shop, one hand on a trolley, and most of what you scan gets rejected within seconds.
So the order matters more than the detail. Sellers triage: can I even list this, does it sell, does the money work, and what happens to the price after I buy. Anything that answers question three before question one is wasting the seconds that matter.
AskJeffy puts the things that stop a purchase at the top. Whether the category usually needs approval. Whether the brand is known to restrict resellers. Hazmat, meltable, and whether Amazon itself is on the listing. If any of those fire, you put it back and never read the rest.
The scanner is live on iPhone and iPad. Download AskJeffy and scan your first product free. Get AskJeffy on the App Store
The most you can pay
One number decides most purchases: the maximum you can pay for a unit and still hit your target return. Everything else is context.
AskJeffy shows it first, worked out from the current selling price, the real Amazon fees for your fulfilment method, and your own target. If the shelf price is below that number, the deal works. If it is above, you walk.
You can also set the price you intend to sell at, separately from the current listing price. Undercut to take the buy box, or price higher when supply is thin, and every figure follows. Add a quantity and you see the total outlay and the total return, not just the per unit maths.
Counted sales, not estimated ones
Most tools show you a modelled monthly sales figure. It is a guess dressed as a fact, and experienced sellers distrust it.
AskJeffy leads with rank drops instead. Every drop in a product's sales rank is a confirmed sale, so counting them gives you a floor rather than an estimate: at least this many units moved in the last 30 days.
Rank itself is shown as a position within its category, not a raw number. A rank of 50,000 is fast in Home and Kitchen and nearly dead in Industrial and Scientific, so the raw figure on its own tells you very little.
Where a listing has several versions and the sales figure may cover all of them, AskJeffy says so rather than letting you assume the number belongs to the one in your hand.
The warning nobody else gives you
The single biggest way money is lost in arbitrage is buying into a listing just before the price collapses. Sellers call the pattern the jaws of death: the number of sellers spikes upward while the buy box price curves down, and everyone who bought at the old price is left holding stock they cannot shift at a profit.
It is visible in the data before it happens. When new sellers arrive faster than a listing has ever absorbed them, and the price is already falling, the collapse is coming.
AskJeffy watches for both halves together and flags it before you spend the money. Both are required: sellers arriving against a firm price is just competition, and a price dip with no new sellers is usually a promotion. Neither on its own means anything.
Amazon on the listing is three situations, not one
Most tools show a red flag when Amazon is selling a product. That is too blunt, and it makes sellers walk away from deals worth taking.
What AskJeffy tells you instead
- Dominant
- Amazon holds the buy box almost permanently and never goes out of stock. Walk away.
- Price matching
- Amazon shares the buy box with sellers who match its price. Workable if the maths hold at that price.
- Periodically out of stock
- Amazon goes out of stock every few weeks. This is an opportunity, and experienced sellers buy specifically to sell into the gap.
AskJeffy works out which pattern applies from the buy box history, and says plainly when there is not enough history to tell them apart rather than guessing.
No score out of a hundred
AskJeffy does not give the scanner a deal score. It used to, and we removed it.
Sellers in this market consistently say the same thing about opaque scores: a single number hides the fee, rank and competition detail they need in order to judge a purchase themselves. A score you cannot verify is a score you cannot trust with your own money.
So the screen shows the checks it ran and what each one found. Concerns first, never buried. Every line is something you can verify against the listing in front of you. Where the data is too thin to judge, it says so instead of filling the gap.
Everything you scan, saved
A scan that vanishes when you close the screen is half a tool. Every product you scan is saved to My Scans, grouped by day and searchable.
What you can do with a saved scan
- Note the shop, the aisle, how many were on the shelf, what the clearance sticker said.
- Record what you bought and how many, so the list doubles as a buy list.
- See the total tied up and how long that stock should take to shift.
- Export the day's sourcing to a spreadsheet in one tap.
- Scan the same product months later and see what you paid last time.
That last one matters more than it sounds. Sellers work the same chains and the same shelves repeatedly, and knowing you already considered a product, and what you concluded, saves rescanning it every trip.
The history sellers actually read
Price and rank history is on the screen, not behind a link to another app. Years of it, with the buy box price, Amazon's price, the listed price, FBA and FBM offers, offer count, rating and review count all available.
Drag along any line to see the value on a given date. Toggle the series you care about and AskJeffy remembers the choice.
Where a product has years of history behind it, AskJeffy also looks for a seasonal pattern. A game selling 35 a month in August may sell ten times that in December, and that turns a pass into a buy. It only says so when the years genuinely agree, and stays quiet otherwise.
Everything a single scan gives you
One barcode, and every figure below arrives at once. Most of it comes from data already held, so a scan is fast and the second person to scan the same product gets the answer instantly.
Eligibility and risk
- Category gating
- Whether the category usually needs Amazon approval, with the matched category named so you can check it yourself.
- Brand restrictions
- Whether the brand is known to limit who may resell it.
- Hazmat
- Whether the listing carries hazardous goods information, which restricts how it can be fulfilled.
- Meltable
- Chocolate, candles and similar, with the restricted window from 16 October to 30 April.
- Amazon on the listing
- And which of the three patterns applies: dominant, price matching, or periodically out of stock.
- Buy box suppression
- When no offer holds the buy box at all, which cuts conversion sharply.
- Private label signal
- Whether the listing has had very few sellers over its life, which can mean it is someone's own brand.
Demand and sales
- Sales rank drops
- Counted over 30 and 90 days. Each drop is a confirmed sale, so this is a floor rather than an estimate.
- Category percentile
- Where the product sits within its category, because a rank of 50,000 means different things in different places.
- Current BSR
- The raw rank, kept visible alongside the percentile.
- Estimated monthly sales
- The modelled figure, shown as secondary and labelled as an estimate.
- Rank trend
- Whether the rank is improving or slipping over 30 and 90 days.
- Variation warning
- Where a listing has several versions and the sales figure may cover all of them.
- Seasonality
- Where years of history genuinely agree, how much faster it sells at its peak, and in which months.
Competition
- Buy box holder and price
- Who currently holds it, at what price, and whether they are Amazon, FBA or merchant fulfilled.
- Buy box rotation
- How many times it has changed hands over 90 days, which tells you how contested the listing is.
- Seller counts
- Split by FBA and merchant fulfilled, since only FBA sellers really compete for the buy box.
- Every live offer
- Each seller with their landed price, condition and fulfilment type, cheapest first.
- FBA and FBM price ranges
- The lowest and highest current price in each, so you can see where you would sit.
- Used and refurbished offers
- The used buy box price and the lowest offer per condition, which quietly cap what a new listing achieves.
- Out of stock share
- How often the buy box has been empty over 90 days.
Money
- Most you can pay
- The maximum unit cost that still hits your target return. The number that decides most purchases.
- Net, margin and ROI
- At your cost and your intended selling price, both of which you set.
- Break even
- The price at which the deal stops making money, flagged when the market is already below it.
- Referral and fulfilment fees
- Itemised, and recalculated when you switch between FBA and merchant fulfilled.
- VAT handling
- For registered, flat rate and unregistered sellers, with the assumption stated on screen.
- Targets by band
- Different thresholds for cheap items, high ticket items, grocery and Q4 toys, or set your own.
- Quantity and totals
- Total outlay and total return for the number you actually intend to buy.
- Sell-through
- How many weeks of stock that quantity represents at your likely share of sales.
History
- Price history
- Buy box, Amazon, listed new, FBA and merchant fulfilled prices over 30 days, 90 days or a year.
- Rank history
- Over the same periods, so you can see whether demand is steady or fading.
- Offer count over time
- How many sellers have arrived or left, which is what makes a price collapse visible in advance.
- Rating and review count
- Tracked over time alongside everything else.
- Scrub any point
- Drag along a line to read the exact value on a given date.
- Price tanking warning
- When sellers are arriving faster than the listing has ever absorbed them and the price is already falling.
The product itself
- Package size and weight
- Which drives the fulfilment fee, and tells you what will fit in the car.
- Listing age
- How long the product has existed on Amazon.
- Variations
- How many versions the listing carries, and what they are.
- Multipack detection
- Whether the listing is for a single unit or a pack, which changes the maths entirely.
- Category path
- The full category, not just the leaf, since gating rules follow the whole path.
- Open the listing
- One tap to the Amazon page, in your marketplace.
Every scan is saved with what you paid, what you bought, the shop you were in and any note you added, so a week later the list still means something.
One thing we cannot do
AskJeffy flags categories that usually need approval and brands known to restrict resellers. It cannot see your own Amazon account's approvals, because that would mean connecting your seller account, and many sellers will not do that.
So a quiet flag means we found nothing, not that you are cleared to sell. Check in Seller Central before you commit to stock. We would rather say that plainly than imply a check we cannot perform.
Frequently asked questions
Is there an Amazon barcode scanner app for iPhone?
Yes. AskJeffy includes a barcode scanner for iPhone and iPad. Point the camera at any retail barcode and the app matches it to the Amazon listing, then shows profit, competition, sales history and eligibility risks.
What does the AskJeffy scanner show me?
The maximum you can pay to hit your target return, sales counted from rank drops, the buy box holder and price, seller counts, category gating risk, brand restrictions, hazmat and meltable status, years of price and rank history, and a warning when a price collapse looks likely.
Can it tell me if I am approved to sell a product?
No tool can see your own account approvals without connecting to your Amazon seller account. AskJeffy flags categories that usually need approval and brands known to restrict resellers, but you should confirm in Seller Central before buying stock.
Does it work for retail arbitrage and wholesale?
Yes. The scanner is built for retail arbitrage, online arbitrage and wholesale sourcing. It records what you bought, where you bought it, and what you paid, and exports a day of sourcing to a spreadsheet.
Which Amazon marketplaces does the scanner support?
The scanner supports the UK and US marketplaces. You set which one you sell in, and the app resolves barcodes against that marketplace with the correct prices, fees and currency.
How is this different from other Amazon scanner apps?
Three things: it leads with the checks that stop a purchase rather than the profit figure, it shows the reasoning instead of a score you cannot verify, and it warns when new sellers are arriving faster than a listing can absorb them, which is the main way money is lost in arbitrage.
Do I need a subscription to use the scanner?
AskJeffy starts with a free trial, and the scanner is included along with the research tools. You can cancel any time.