CalculusStructural Modeling in Your Browser

Create and detail 3D structural models with beams, plates, bolts, welds, rebar, and more — no installation needed.

Steel & Concrete Detailing

Model beams, columns, plates, bolts, welds, and rebar with parametric profiles, materials, and precise positioning.

Profile & Material Libraries

Work with standard European steel sections (IPE, HEA, HEB, CHS, RHS…), concrete grades, bolt assemblies, and rebar grades. Create your own or import from your team.

IFC & Reference Models

Export your model to IFC 4x3 for coordination with architects and other engineers. Import IFC, glTF, or PLY files as reference overlays.

Works Anywhere

Runs entirely in your web browser — no installation, no licenses, no IT department. Just open the link and start modeling.