3sec Check
Upload a screenshot. AI detects marketplace scam signals.
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Chan Yoon Jung

3sec Check - Upload a screenshot. AI detects marketplace scam signals.

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3sec Check analyzes screenshots of marketplace conversations to detect scam patterns. Catches fake payment links, off-platform payment requests, trust manipulation tactics, and more. Supports Facebook Marketplace, Craigslist, eBay, Gumtree, and more. Get an instant risk assessment with specific scam signals and recommended actions. No sign-up needed, free to use.

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Chan Yoon Jung
Maker
šŸ“Œ
Hey everyone šŸ‘‹ I'm a maker from South Korea, and I built 3sec Check after seeing more and more scam cases on second-hand marketplaces. What started as a local problem quickly felt global ā€” the same fake payment links, fake "safe transaction" pages, shipping excuses, and pressure tactics appear across platforms worldwide. So I wanted to create something extremely simple: Upload a screenshot of a suspicious chat, and AI instantly analyzes it for scam signals and risky patterns. The service currently supports both Korean and English, and I'm also experimenting with localized safety guidance depending on language and region. āœ… Free to use āœ… No sign-up required āœ… Takes only a few seconds Would genuinely love your feedback and ideas for improvement šŸ™