See space the way a person standing in it does. Draw walls and obstacles in plan, drop a viewpoint, and the tool casts rays to map the isovist — everything visible from that spot — and measures it: area, perimeter, visible vertices, compactness and drift. Move the viewpoint and watch the field of view change, the basis of space-syntax analysis.
Runs entirely in your browser — nothing is uploaded. Export the plan with its isovist and metrics as SVG or PNG.