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3sec Check
Upload a screenshot. AI detects marketplace scam signals.
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.
Hey everyone 👋
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 — 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.
✅ Free to use
✅ No sign-up required
✅ Takes only a few seconds
Would genuinely love your feedback and ideas for improvement 🙏
About 3sec Check on Product Hunt
“Upload a screenshot. AI detects marketplace scam signals.”
3sec Check was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #60 on the daily leaderboard. 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.
On the analytics side, 3sec Check competes within Productivity, Artificial Intelligence and Security — topics that collectively have 1.1M followers on Product Hunt. The dashboard above tracks how 3sec Check performed against the three products that launched closest to it on the same day.
Who hunted 3sec Check?
3sec Check was hunted by Chan Yoon Jung. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of 3sec Check including community comment highlights and product details, visit the product overview.
Chan Yoon Jung