I spent 30 years in Japanese construction — carpenter, site supervisor, CM. I watched homeowners get systematically overcharged.
HORIZON SHIELD uses AI to diagnose construction cost estimates. Upload a quote photo and get a diagnosis in 30 minutes. Real case: found ¥500,000 in overbilling on a ¥3,800,000 quote.
Backed by Japan's first open construction cost database (87 plans, 88 fraud patterns, CC-BY 4.0) on Zenodo and GitHub.
Free AI diagnosis via ChatGPT and LINE.
