Too little checked to say Store information only. We haven’t analysed this app or read its reviews yet.
Not yet tested.
The store currently lists version 1.4.2, updated 2026-10-07.
Store screenshots supplied by the developer.
Preview3D is a fast, native iPhone and iPad viewer for the 3D formats you actually use — from CAD to mesh to 3D printing — in one clean window.
Open a STEP file from a vendor, a painted 3MF from your slicer, or an STL someone sent you, and see it instantly — in the app, or right in the Files app with Quick Look and 3D thumbnails. No web uploads, no account, no clutter.
SUPPORTED FORMATS
• STEP / STP, STL, OBJ, PLY
• glTF / GLB, USDZ / USD, COLLADA (DAE)
• 3MF — including painted multi-material prints
• FBX, 3DS, X3D, LWO, MS3D, AC, AMF, OFF and more (via Assimp)
• G-code and PrusaSlicer binary G-code (.bgcode)
REAL STEP SUPPORT
Preview3D reads STEP with a pure-Swift B-rep kernel: watertight tessellation and crease-aware normals straight from the exact geometry, so cylinders stay smooth and edges stay crisp.…
From the developer’s store description.
For developers and the curious
The evidence, sources, measurements and versions behind every label above.
No review analysis published for this app.
“Not assessed” means we could not measure it. It is never a zero and never a pass.
No package has been scanned for this app, so nothing is published about what it ships. That is an absence of evidence, not a finding.
Supporting measurements: not a complete list of possible harms or positives. Measurement vocabulary 1.4 · how these are measured
Not yet tested. No analysis has been run for this app, so there is no version or date to report.
Each store’s release notes, as the developer wrote them. They are the developer’s words, not ours.
Wireframe that looks the same every time • An STL opened straight into Wireframe drew every one of its triangles — a solid smear on a detailed model — and only switching to “Shaded with edges” and back gave the clean view. Wireframe now always shows the model's edges and outline, whatever came before.
Appworthy
preview3dWhat the stores publish. Store ratings are the stores’ numbers, not Appworthy’s, and are never averaged across stores.
No itemized purchase list is available for this listing.
Not yet tested. No analysis has been published for this app, so there is no method to describe for it yet. A missing label is not a clean bill of health: it means nothing has been read, not that nothing is wrong.
Write to [email protected], or use the form. Name the finding, the app version and the evidence that needs correcting. Factual corrections are free and never depend on buying anything.