Creallo Atlas is a free 3D-file viewer for Windows, macOS and Linux intended to support manufacturing reviews without a paid CAD licence. It opens files locally and provides measurement, sectioning, wall-thickness and mesh diagnostics without sign-in. That is a meaningful distinction from upload-only web viewers, but local and cloud-linked functions must be separated in any security assessment.

Formats and local processing

The official documentation lists STEP, STP, IGES, IGS, BREP and BRP for CAD, plus STL, OBJ, PLY, OFF, 3MF, GLB and glTF meshes. The vendor states no size limit for files opened locally, and the application can work offline. STEP assembly names and colours may be retained, while selected components can be exported as STL.

The viewer calculates volume, area, bounding box, point distance, diameter, wall thickness and gaps. A section plane exposes cavities and possible interference. Mesh inspection can flag open edges, inverted normals, degenerate or duplicate triangles and non-manifold edges. These are useful screening checks, not substitutes for drawing tolerances, build orientation or process capability.

Where the cloud begins

Opening, measurement, sectioning, thickness checks and diagnosis work without an account. Automatic mesh repair, part merging and share links require sign-in. Shared STL, STEP and STP files have a stated 50 MB limit. A confidential-data policy must therefore record which functions users may enable and whether an upload took place; calling the whole product local would be incomplete.

Repair and reference pricing

Atlas can close holes and address inverted shells, degenerate triangles, duplicate faces and non-manifold edges. A repaired mesh can be closed while still changing design intent. Compare volume, bounding box, critical holes, wall thickness and triangle count before and after repair, then treat the output as a new revision.

Geometry-based reference pricing is available for 3D printing, CNC and vacuum casting. It is useful for orientation, not a binding quote or a full-cost model. Material, tolerance, finish, post-processing, qualification, quantity and delivery can change the final price.

Practical conclusion

Atlas is most useful as a fast cross-platform review layer: purchasing, manufacturing engineering and quality teams can inspect the same model without a full CAD seat. Before rollout, verify measurements, assembly trees, exports and defect detection with known reference files. Allow local mode through an internal data policy and treat sign-in and sharing as separate gates tied to information classification.

Sources and transparency

Features were checked against Creallo Atlas's official English product page and guide. Performance and platform claims are vendor statements; no independent large-file benchmark was available.