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← ylishi.toolsKey fact: Product research is a demand-versus-competition test, and on most ASINs review count and review velocity move before price does. Reading a product page tells you what a competitor charges; it does not tell you whether the demand is still growing. The free ASIN analyzer scores any product on demand, competition and profit potential, so a shortlist is built on data instead of on a category hunch.
An ASIN (Amazon Standard Identification Number) is a unique 10-character identifier assigned to every product on Amazon. Our free ASIN tool helps sellers:
Enter any ASIN above to start your product research analysis.
| Product | Demand | Competition | Profit | Trend | Score | Actions |
|---|---|---|---|---|---|---|
No products yet. Click "Add Product" to start. | ||||||
An ASIN is printed nowhere on the product itself, which is why most sellers end up hunting for it. There are three reliable ways to find one, and all three are free:
/dp/ or /gp/product/ — for example amazon.com/dp/B0XXXXXXXX. Copy the ten characters that follow.Two things trip people up. An ASIN is marketplace-specific: the identical product carries a different ASIN on amazon.com, amazon.co.uk and amazon.de. And product variations such as size, colour or pack count each get their own child ASIN tied to a parent ASIN, so “one product, one ASIN” is usually wrong for anything with options.
These five identifiers turn up in every sourcing spreadsheet, and mixing them up costs money at the label-printing stage. Here is how they differ:
| Identifier | Assigned by | Length | Scope | What you use it for |
|---|---|---|---|---|
| ASIN | Amazon | 10 characters | Amazon catalogue — one per marketplace | Identifying and tracking a listing |
| UPC | GS1, via the brand owner | 12 digits | Global retail, US-centric | The barcode printed on retail packaging; sourcing |
| EAN | GS1 | 13 digits | Global retail, EU and international | The barcode most non-US sourcing runs on |
| SKU | You, the seller | Any format you like | Your own inventory system only | Internal stock keeping and margin tracking |
| FNSKU | Amazon | 10 characters, usually starting X00 | Amazon FBA, unique per seller | The label affixed to every FBA unit |
In practice you source against a UPC or EAN, list against an ASIN, and ship against an FNSKU. When a supplier quotes only a barcode, converting it to an ASIN is step one of validating the product.
Being clear about the limits of free data is what stops a bad purchase from being dressed up as a good score.
Paid suites such as Helium 10, Jungle Scout, SellerSprite and ASINspector earn their subscription through reverse-ASIN keyword databases and long historical graphs. Use a free scorer the way it is meant to be used: shortlist aggressively, then spend money only on the few ASINs that survive.
Every ASIN is scored on four weighted factors. The defaults are Demand 30%, Competition 25%, Profit 25% and Trend 20%, and the sliders above let you change them without losing your shortlist.
Reweight to match your model: private label sellers should push Competition higher, while wholesale and arbitrage sellers usually care more about Profit and Demand. Each factor is shown as its own band, so a weak one stays visible instead of being averaged away.
Go deeper: the 2026 product research method and metrics, choosing a niche, finding and vetting suppliers, reading demand trends, and the ROI math before you buy inventory.
Rate demand, competition, profit and trend — pick winners with a weighted score.
An ASIN (Amazon Standard Identification Number) is the ten-character code Amazon assigns to every product in its catalogue. It is unique within a single marketplace, so the same physical product carries a different ASIN on amazon.com, amazon.co.uk and amazon.de.
There are three free ways. Read it from the listing URL, where it follows /dp/ or /gp/product/. Open the product information table on the listing, which lists the ASIN alongside the matching UPC or EAN. Or paste the listing URL directly into the analyzer above, which accepts either a bare ASIN or a full URL.
Yes. The ASIN lookup, the four-factor score and the score overview chart are free, with no signup and no paid plan required to use them.
No, and anything that claims otherwise should be treated with suspicion. Amazon does not publish unit sales, so every figure you see elsewhere is an estimate derived from Best Sellers Rank and review velocity. This tool treats those as demand signals and scores them instead of presenting them as sales data.
Those suites are built around reverse-ASIN keyword databases, long historical price and BSR graphs, and bulk exports. This Amazon ASIN lookup tool is a free triage layer: it uses catalogue attributes, current rank and fee-adjusted margins to tell you quickly whether an ASIN deserves that paid subscription at all.
No. ASINs are assigned per marketplace, so a product live in the US, the UK and Germany has three separate ASINs. Expanding across marketplaces means mapping them, not reusing one code.
❓ Amazon ASIN Tool — Frequently Asked Questions → fees, limits, and worked examples
Written and maintained by the ylishi.tools editorial team, which has tracked Amazon, Temu and TikTok Shop seller fees since 2019. Spotted an error or a stale rate? Email support@ylishi.tools — figures on this page are corrected whenever the published fee schedule changes.