TrustScan reads the listing you are already looking at and scores it out of 100. Everything is computed inside your browser.
It makes no network request at all, not even to the two sites it reads.
The extension is in private testing. The score will stay free when it ships.
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On Leboncoin or Vinted. Nothing to launch, nothing to paste.
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In the corner of the page, with the score out of 100.
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Every signal is listed with the weight it carried. No black box.
Every listing starts at 70. Each signal found adds to or subtracts from that figure, and the panel shows the arithmetic in full.
A score on its own is worth little. What matters is what is behind it, so the extension shows you, signal by signal.
“Message me directly, we can settle it off the platform, it saves the fees.”
Leaving the platform removes the only recourse you have if the item never arrives. It is the common thread in most reported scams, and it carries the heaviest penalty of the whole engine.
Member for 11 days.
A new account proves nothing on its own. Next to an expensive item and a seller in a hurry, it is the usual shape of a throwaway profile.
One picture, no close-up, no serial number, no sign of wear.
People selling something they own photograph it from several angles. A lone picture is often lifted from a catalogue. Three photos or more, on the other hand, earn ten points back.
It also looks at poor seller ratings, which the platforms bury under flattering averages: below 4.3 out of 5 already stands out.
A seller with 438 reviews, on an eight-year-old account, asking to be paid by bank transfer outside the platform: TrustScan will never show that as trustworthy. Not because they are a crook, they probably are not, but because paying outside the platform leaves you without recourse if the parcel never arrives. The listing turns amber, the reason is spelled out, and you decide.
Open a seller profile rather than a listing and the badge scores the seller alone, on the same scale. Useful when several people are selling the same item and you have to choose one.
You do not have to take our word for it. Open chrome://extensions, turn on developer mode, then click Details under TrustScan: Chrome itself lists every permission granted. You should read two allowed sites, leboncoin.fr and vinted.fr, and nothing else. The files of the installed extension can also be read on your disk, in the Chrome profile folder.