WyzeSolid

WyzeSolid is a viewer and light editor for 3D CAD files. Open a STEP, IGES, BREP or STL model, turn it around, measure it, and for STEP files go further: round edges, hollow out a part, combine or subtract solids, move, rotate, scale and mirror, then export.

It is built on the open-source Open CASCADE geometry kernel and runs entirely on your Mac. Your models are never uploaded and no account is needed. It is a focused tool for quick checks and simple edits, not a full replacement for a professional CAD suite, and the page says where it stops.

What you get

1. Opens the common CAD formats — STEP (.step, .stp), IGES (.igs, .iges), BREP (.brep) and STL. Drop a file in the window or double-click it in Finder. A STEP file with several solids opens as several parts.
2. Real solid modelling — STEP files stay editable: the app works on true solids, not just on a mesh, so edits stay precise.
3. Fillet and chamfer — Pick one or several edges, enter a radius, and round or bevel them. Undo brings the part back.
4. Shell a part — Choose the faces to open and a wall thickness to hollow a solid out.
5. Combine solids — Select two parts and use Union, Subtract or Intersect to build a new shape from them.
6. Move, rotate, scale, mirror — Place a part by typing exact values, rotate it around an axis, scale it, or mirror it across a plane. Duplicate or delete parts.
7. Basic shapes to start from — Add a box, cylinder or sphere and combine them. Try the built-in sample part if you only want to look around.
8. Measure with snapping — Click two points to read the distance and its X, Y and Z components. Points snap to vertices, midpoints, centres and surfaces.
9. Properties at a glance — See the volume, surface area and overall dimensions of a part, the length of a chosen edge, and the angle between two faces, in millimetres, centimetres, metres or inches.
10. Undo, save projects, export — Undo and redo every edit. Save your work as a WyzeSolid project, or export to STEP, STL, OBJ or PLY. Light and dark themes, in English and French.

Perfect for

• Makers and 3D printing fans who need to check or tweak a downloaded part
• Engineers and students who want to look at and measure a STEP file without a heavy CAD suite
• Anyone who receives CAD files from suppliers and just needs to open them
• People who cannot upload confidential models to an online viewer