Who it is for
A homeowner or property manager in Japan holding a construction or renovation quote and wanting a second opinion on the number.
HORIZON SHIELD
Fair-price check on Japanese construction quotes
Overview
What HORIZON SHIELD does
HORIZON SHIELD assesses whether a quoted price for construction or renovation work in Japan is reasonable. The inputs are a work type and the amount quoted. The app then places that figure against expected price ranges, marks where the risk of overcharging lies, and breaks down the unit prices behind the total.
It also scans the wording of an estimate for the sort of pressure tactics that turn up in sales pitches.
Two sources sit behind the price ranges. One is JCCDB, a construction-cost dataset published openly, which the record puts at 65,729 line items sorted into 398 categories. The other is three decades of on-site building experience, which the developer describes as the basis for how the ranges were curated.
What stands out
Alongside the price comparison it looks for high-pressure sales language in the quote itself, which is a separate question from whether the arithmetic is fair.
Availability
Where HORIZON SHIELD is listed
HORIZON SHIELD is listed in the ChatGPT apps directory only. The HORIZONs Inc. has no connector under the same domain in the Claude directory; 392 of the 3,150 products here are on both marketplaces, and this is not one of them.
ChatGPT apps are built on MCP, and the same server can back a Claude connector, so the absence is a distribution decision rather than a technical one.
ChatGPT listing
In the ChatGPT apps directory
- Developer
- The HORIZONs Inc.
- Filed under
- Other
- Listed since
- June 2026
- Authentication
- Authenticates when installed
- Policies published
- Privacy policy · Terms of service
- Official listing
- Open in ChatGPT
- Snapshot
- August 2026
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This is an independent catalogue entry compiled by Node8 from HORIZON SHIELD's public marketplace listing as it stood in August 2026. Listing facts come from the marketplaces; the comparisons against the rest of the directory and any live-endpoint measurements are Node8's. Node8 is not affiliated with The HORIZONs Inc., and inclusion here is not an endorsement.
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