Seller tooling is sold on metrics that sound standard and are calculated differently by every vendor. These are the ones that decide a call, and each links to where we test it.
The research vocabulary, and what each number can and cannot tell you.
The process of identifying what to sell using demand, competition and margin data. Every tool in this category is doing estimation from public signals rather than reporting facts, so the meaningful comparison between them is estimate accuracy, not feature count.
Where we cover itA tool projection of how many units a listing moves, inferred from rank and category rather than observed. Estimates from two tools for the same listing routinely differ by a wide margin, which is the most important thing to know about them.
Where we cover itFinding the search terms buyers actually use, and how contested each one is. It drives both listing copy and advertising, and it is the input where tool quality differs most visibly.
Where we cover itThe mechanics that decide whether a sale happens and what it costs you.
The default purchase option on a listing shared by several sellers. It accounts for the overwhelming majority of sales, and it is awarded on a combination of price, fulfilment method and seller performance rather than on price alone, which is why undercutting does not reliably win it.
Where we cover itWho stores, picks, packs and ships. The marketplace-run option costs more per unit and materially improves buy-box competitiveness and delivery promise, so the comparison is never purely a cost one.
Where we cover itThe product page itself. Multiple sellers can share one listing, which is why listing quality is partly outside your control and why a change to it affects competitors as well as you.
Where we cover itThe advertising metrics, which are the most commonly misread numbers in the category.
Advertising cost of sale: ad spend divided by the revenue those ads produced. It measures the efficiency of the ADVERTISING only and says nothing about whether the product is profitable, which is why a good ACOS on a thin-margin product is still a losing position.
Where we cover itSales that arrive without advertising. The relationship runs both ways: advertising can lift rank and therefore organic sales, so judging a campaign on its ad revenue alone understates it.
Where we cover itWhat you are willing to pay for a click. Bids are set per keyword and interact with relevance, so the highest bid does not simply win, and bid management is most of what advertising tools are actually selling.
Where we cover itPairs that appear side by side in a dashboard and measure different things. Each one changes a decision.
ACOS measures advertising efficiency: ad spend against ad revenue. Margin measures whether the product makes money after every cost. A campaign can show an excellent ACOS on a product that loses money on each unit, and dashboards put the two next to each other without ever reconciling them.
Where this bitesThe listing is the product page. The buy box is the default purchase option ON that page, which several sellers compete for. Winning the buy box is not the same as owning the listing, and it is decided on fulfilment and performance as much as on price.
Where this bitesProduct research is the process; a sales estimate is one inferred input to it. Estimates are projections from rank rather than observations, and two tools frequently disagree substantially about the same listing, so treating an estimate as a measurement is where most bad decisions start.
Where this bitesOrganic sales arrive without advertising; a bid is what you pay for a click. They are not independent: advertising can raise rank and therefore lift organic sales, so cutting bids to protect ACOS can quietly reduce the free sales the advertising was generating.
Where this bitesFulfilment is who ships. The buy box is who gets the sale. They are linked because fulfilment method is one of the strongest inputs to buy-box eligibility, which is why a cheaper self-fulfilled offer can lose to a more expensive one.
Where this bitesMarketplace fees, programme rules and tool pricing change frequently. These describe how the terms are generally used; the marketplace and vendor current documentation governs.