About BrandCheck

Our mission

The luxury resale market is a $50B+ industry — and roughly 1 in 4 items sold on secondary marketplaces is suspected to be counterfeit. BrandCheck exists to give every buyer a 60-second, evidence-based verdict before they pay.

We don't replace professional authentication for $10,000+ purchases. We catch the obvious fakes — the misaligned monograms, the wrong serial-format date codes, the off-color hardware, the embroidery that's just slightly wrong — and surface them to you in plain language with a confidence score.

What we check

For every item, our model evaluates six dimensions:

• Serial number — format, font, placement against brand-specific rules
• Stitching — evenness, thread color, density
• Hardware — engraving depth, weight cues, finish
• Logo — proportions, font, alignment across seams
• Material — leather/canvas grain, sheen, texture
• Labels — interior tags, made-in stamps, hologram cues

How we built it

BrandCheck combines Anthropic's Claude vision model with 154+ brand-specific authentication rule sets curated from public auction data, reseller authentication communities, and brand reference materials. Every brand has its own prompt-augmentation hints (50–200 words of specific tells) injected into the analysis.

We're transparent about limits: AI is good, but it's not infallible. See our Methodology page for the full picture, including known failure modes.

Independent and ad-free

BrandCheck is independently operated. We're not affiliated with any brand we authenticate, accept zero brand sponsorships, and run no advertising on the site. Our only revenue is per-check fees from end users (US$0.20–0.49 per check).

Operator details for legal/billing purposes are listed on the Contacts page as required by EU and platform regulations.

General contact: support@brandchecker.site