3D-Tool vs Spin 3D

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.

Spin 3D converts 3D mesh files between formats for 3D printing, game modding, design, and animation. Its product page lists more than 45 supported formats, including STL, 3DS, 3DP, 3MF, OBJ, and PLY; listed outputs include OBJ, STL, PLY, 3DS, 3MF, and 3DP. Users can preview source models and conversion results, adjust default translation, rotation, and scale values, recalculate normals, and remove duplicate triangles and vertices. Multithreaded batch processing can convert hundreds or thousands of files at once. Downloads are offered for Windows 7 to 11 and macOS 10.9 or later; the maker directs Mac, Linux, and Chrome OS users to its online converter. The free version is for non-commercial use only. Format support has qualifications: OBJ material files are not supported yet, and some formats are read-only or require an optional component. Converted models can be imported into DreamPlan Home Design Software. Support resources include tutorials, a manual, FAQs, a forum, and technical support contact.