3D-Tool vs CADViewer by Orua

3D-Tool is a Windows CAD viewer and converter for opening, inspecting, measuring, analyzing and converting 3D models and 2D drawings without a separate CAD system. It reads more than 30 3D formats and supports DXF, DWG and HPGL drawings, though available formats depend on license edition. Measurement tools cover distances, angles, radii, wall thicknesses and clearances, and calculate centers of mass, surface areas, contour lengths and minimum bounding boxes. Analysis includes tooling, wall thickness, collisions and model comparison, with results shown as heatmaps. Models can be exported as EXE files or 3D-PDF; Premium adds 3D-HTML conversion and native interfaces for listed CAD systems. The Free Viewer opens DDD, STL and 3MF files, has no time limit or registration requirement, and permits commercial use. Paid single-user licenses are one-time purchases: Basic is € 200, Advanced € 400 and Premium € 800, plus VAT. A 14-day trial unlocks all functions and import formats.

CADViewer by Orua is a free, open-source browser viewer for large engineering drawings and read-only previews. It opens DWG, DXF, STL, STEP/STP, IGES/IGS, and BREP/BRP files through one entry point and toolbar. DWG and DXF files are parsed in a Web Worker with LibreDWG WebAssembly and rendered progressively using Canvas 2D and Path2D. Three-dimensional formats use OpenCascade WebAssembly and WebGL, with selectable metal surface finishes. Controls include pan, wheel zoom, fit-to-view, zoom window, drawing-list visibility, and light or dark backgrounds. Fonts can load on demand, and deployment configuration supports Simplified Chinese and English. The viewer runs on a static web server without an application server or database, with offline or private-network options. Locally selected files stay in browser processing without an account or upload API. It is read-only and lacks editing, property panels, selection workflows, and plugins.