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

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 🙏