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Dev.to
5/10/2026
I Built a Chrome Extension That Catches Japanese Ad Law Violations in Real Time

I Built a Chrome Extension That Catches Japanese Ad Law Violations in Real Time

Short summary

The author built AdLegalCheck, a Chrome extension that automatically scans webpages for violations of Japanese advertising law—including misleading claims, prohibited health/beauty efficacy claims, and undisclosed sponsorship. It combines regex-based keyword matching (68 high-risk patterns) with optional GPT-4o-mini AI analysis for context-aware evaluation. The extension is live on the Chrome Web Store with a free tier (3 scans/month) and monetization via ExtensionPay.

  • •Built a Chrome extension scanning for Japanese ad law violations in real-time
  • •Uses keyword matching (68 patterns) plus optional GPT-4o-mini AI analysis for nuance
  • •Live on Chrome Web Store with freemium model (3 scans/month free)

Generated with AI, which can make mistakes.

#ai-tools#product-launch#certification-education
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