Known limitations

The code checks are an aid, not an approval. A PASS against an IBC, IRC or ADA section is not a permit or a certification: the rule packs cover only part of each code, many verdicts rest on assumptions the Problems panel lists, and the building department (the authority having jurisdiction) and a licensed professional have the final say on a design.

Curved walls must be split into straight segments.
Exports: SVG, GeoJSON, OBJ, 3D prisms, the Three.js page and the door / window schedule. There is no DXF or IFC export. The editor exports PNG and prints to PDF through the browser.
No importers. Plans come as bldg JSON: drawn in the editor, traced from a plan image by its AI assistant, or written by hand. IFC, DXF and Apple RoomPlan files cannot be read.
Catalog plugins are JSON only. Your own models are JSON catalog files (validated, never executed); there are no code plugins.
In OBJ / Three.js, sliding, pocket and folding doors are the void plus header without a leaf. The fold side of a folding door is not stored; it is drawn folding to side A.
GeoJSON coordinates are planar plan units (local CRS by prior arrangement under RFC 7946 §4), not WGS84.
GB/T 50353 and GB/T 17986.1 clauses are recalled, not verified against the standard; bay windows, canopies, external stairs and shared-area apportionment (公摊) are not modelled.
US opening marks are ambiguous at 10 and 11 inches. D3068 encodes feet and inches as one digit each, so a 5'-10" window writes W51040 (deferred; the type's width and height are the data, the mark only a name).
No mixed operation. A window with panels of different operations (a fixed light beside a casement) is one operation per type today; per-panel operations need a panels contract and are deferred, as are a bay window's form and a door's travel / leaf count / sliding axis.

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