HORIZON SHIELD

What it does

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.

リフォーム・外壁塗装の見積もりが高すぎると感じたら。ホライゾンシールド（HORIZON SHIELD）は建設実務30年のプロとAIが単価・数量・諸経費まで突合し、過剰請求のサインを見抜く建設費診断サービスです。手元の見積書の診断にも、工事内容から適正価格を先に知る逆見積もりにも対応。業者より先に、あなたが価格を知るための道具です。監査ハッシュ付きで、その判定は誰でも再現できます。

※ 2026年5月6日、engrXiv にて公開（Preprint ID: 7007 / DOI: 10.31224/7007）。engrXiv は Open Engineering Inc.（米国501(c)(3)非営利団体）が運営するエンジニアリング系プレプリントサーバーで、DOIを発行します。データセットはCC-BYfrom shield.the-horizons-innovation.com

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