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

A developer built AdLegalCheck, a Chrome extension that scans Japanese webpages in real time for ad-law risks.

It highlights risky phrases, assigns a risk score, and can use GPT-4o-mini to judge context.

The tool checks for issues under Japan’s rules on misleading claims, cosmetic claims, and undisclosed sponsorships.

It aims to help marketers and reviewers catch problematic copy before publication and reduce compliance work.