Observed arrival · 2026-09-25

A Browser-Based Sky-Exposure Checker for DXF Plans

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Editorial interest 82/100 Selection signal · not a rating of the site

The site describes a free browser tool that calculates Japanese road-side and north-side sky-exposure ratios from DXF building plans, then outputs drawings and DXF files.

Landing page captured for the 2026-09-25 issue.

For: Architects and designers checking Japanese building height restrictions
Worth noticing: The instructions warn that omitted rooftop equipment can make the calculated sky ratio appear more favorable than reality.

Field notes

The instructions specify that site and building geometry should share coordinates, use millimetres, and set Z=0 to the design ground level. The page says curved solids are subdivided into planar facets with deviation of 2 mm or less, which makes the calculated sky ratio slightly conservative.

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