VIEW
Navigate complex models
Orbit, pan and zoom a responsive 3D scene with axes, grid, bounding box, wireframe and orthographic controls.
Private CAD inspection / iPhone · iPad · Mac
DWG, STEP and STL viewer for iPhone, iPad and Mac.
CAD beyond the workstation.
Open DWG, DXF, STEP, IGES, STL, OBJ, 3MF, PLY, glTF and USDZ on device. Inspect, check dimensions, place in AR and export a PDF report.
PRIVATENo model upload or cloud conversion.
MOBILEBuilt for touch, trackpad and field work.
SPATIALPlace supported geometry in camera AR.
USEFULMetrics, local library and PDF reports.
From file to field view.
Open the model, focus on the geometry that matters, and take a supported mesh into the room. CadRoam keeps the workflow compact without hiding technical limits.
INSPECT
Read useful geometry
Review bounds, triangles, surface area and enclosed volume when the source geometry supports those calculations.
PLACE
See scale in camera AR
Place renderable geometry on a detected surface, then fit, rotate and scale it with familiar touch gestures.
Open. Inspect. Share.
No account setup and no cloud-conversion queue. Start from Files, keep a local library, and export a compact inspection PDF with CadRoam Pro.
Open from Files
Import DWG, DXF, STEP, IGES, STL, OBJ, 3MF, PLY, glTF or USDZ from iCloud Drive, local storage or another document provider.
Inspect on device
Isolate objects, switch display modes and review mesh-derived measurements without uploading the model.
Place or report
Use camera AR on supported iPhone and iPad, or generate a local PDF for a design conversation.
The model stays with you.
CadRoam is designed around a local engine. Files are copied only into the private on-device library you control; model contents are never sent to a developer-operated conversion service.
Inspect
Orbit, zoom, isolate assembly objects, use wireframe, orthographic and transparency modes, and read geometry metrics when available.
Place in AR
Detect a real surface, tap to place, then choose fitted or source-unit scale, pinch and rotate. Camera frames remain in Apple ARKit.
Report
Generate an inspection PDF locally and export or share it with system tools on iPhone, iPad and Mac.
Honest format support.
CadRoam reports exactly what its engine can render. DWG, DXF, STEP, IGES, STL, OBJ, 3MF, PLY, glTF and USDZ are all processed on device, and anything an exporter writes outside that scope is named instead of failing silently.
DWG
AutoCAD R13–R2018+ linework, blocks, text, dimensions, hatches and layouts.
ReadyDXF
ASCII and binary drawings: linework, text, dimensions, blocks and mesh faces.
ReadySTEP
Exact B-Rep, curved surfaces, assemblies and AP242 tessellation.
ReadyIGES
B-Rep and curved surface geometry.
ReadySTL
Binary and ASCII triangle meshes.
ReadyOBJ
Indexed objects, groups and materials.
Ready3MF
Core 3MF mesh packages from slicers; unsupported extensions are named.
ReadyPLY
Polygon meshes from 3D scanners and mesh tools.
ReadyglTF / GLB
glTF 2.0 and GLB meshes with node transforms and material colours.
ReadyUSDZ
USDZ, USD, USDA and USDC meshes with material colours.
ReadyA viewer for the space between desks.
CadRoam is useful when the model needs to leave the authoring workstation but should not leave your control.
Engineering review
Carry a reference model into a meeting, isolate parts and discuss geometry without launching the authoring suite.
Workshop checks
Compare overall bounds and part orientation near a bench, machine or assembly area.
3D-print preparation
Review STL, OBJ, 3MF and PLY meshes, triangle density, dimensions and enclosed-volume estimates before handoff.
Client walkthroughs
Use a clean touch viewer or supported AR placement to explain a design away from the workstation.
Private by architecture
Your model is not our dataset.
Model contents are processed on device. CadRoam has no account, advertising, third-party analytics or developer-operated conversion cloud.
- Local model processing
- No model-content upload
- No account required
- Camera only when AR opens
CAD viewer questions.
Can CadRoam open STEP files?
Yes. CadRoam renders exact B-Rep, curved surfaces, assemblies and AP242 tessellated STEP on device. Where an exporter-specific record falls outside the engine, CadRoam says so instead of presenting an empty result as success.
Which 3D file formats render now?
DWG, DXF, STEP, IGES, STL, OBJ, 3MF, PLY, glTF/GLB and USDZ all render in the current engine. DWG and DXF include text, dimensions, hatches and paper-space layouts for AutoCAD R13–R2018+, and STEP and IGES include exact B-Rep and curved surfaces. Coverage still varies across schema editions and exporter-specific records, so an unusual export can render partially.
Are CAD files uploaded to a server?
No. CadRoam copies imported files into its private on-device library and processes model geometry locally. It does not send model contents to a developer-operated cloud conversion service.
How does augmented reality work?
On a supported iPhone or iPad, CadRoam Pro uses Apple ARKit to detect a surface. You tap to place compatible geometry, then rotate and scale it. Camera access is requested only when you enter AR.
Is CadRoam a certified measurement tool?
No. Mesh-derived bounds, area and volume are inspection aids. Verify source units, tolerances and safety- or manufacturing-critical decisions in the original CAD system or a certified metrology workflow.
Open the file. Know the limits.
Practical guides for STEP, STL, IGES, desktop inspection and camera AR, written around what the app actually supports.
STEP / STP
How to open a STEP file on iPhone or iPad
Open STEP and STP models on iPhone or iPad. Inspect supported curved surfaces, B-Rep and tessellated geometry locally, with clear import warnings.
Open field manual →IGES / IGSHow to open an IGES file on iPhone, iPad or Mac
Open supported IGES and IGS curved surfaces on iPhone, iPad and Mac. Tessellation runs on device, with no upload or online converter required.
Open field manual →STL / MESHA private STL viewer for iPhone and iPad
Open binary or ASCII STL files locally, inspect mesh geometry and check dimensions, triangle count, area and enclosed volume on iPhone or iPad.
Open field manual →MAC / DESKTOPHow to view STEP, STL and OBJ files on Mac
Use a lightweight local CAD viewer on Mac to inspect supported STEP, STL and OBJ geometry, isolate parts and create a compact PDF report.
Open field manual →AR / FIELDHow to inspect a 3D CAD model in AR on iPhone
Place supported rendered STL, OBJ or STEP geometry on a detected surface with CadRoam Pro and understand scale, tracking and inspection limits.
Open field manual →DWG / MACBest DWG viewer for Mac (2026)
AutoCAD has no Mac-native free viewer. Compare the four realistic ways to open a DWG file on macOS and see where a local viewer such as CadRoam fits.
Open field manual →DWG / IOSHow to open a DWG file on iPhone or iPad
Open an AutoCAD DWG drawing on iPhone or iPad without an AutoCAD subscription or a browser upload, and understand which revisions and drawing entities are supported.
Open field manual →DXF / APPLEBest DXF viewer for Mac, iPhone and iPad
Open ASCII and binary DXF drawings on Apple devices without a converter site. Compare the options and see what a local DXF parser reads from a real drawing.
Open field manual →STEP / MACBest STEP file viewer for Mac (2026)
Open STEP and STP assemblies on macOS with exact B-Rep and curved-surface support, locally, without a CAD subscription or an upload to a conversion service.
Open field manual →CAD / IPADBest CAD viewer app for iPad (2026)
One iPad app that opens DWG, DXF, STEP, IGES, STL and OBJ locally, works with no signal, and offers a one-time lifetime purchase as well as monthly or yearly plans.
Open field manual →DWG / NO CADHow to open a DWG file without AutoCAD
Four ways to read an AutoCAD drawing when you do not own AutoCAD, what each one costs you in privacy or structure, and which fits occasional review.
Open field manual →AVAILABLE ON THE APP STORE
CAD that goes where the work goes.
CadRoam is available for iPhone, iPad and Mac. Inspect three different files free. Reopen those files without using another import. Pro adds unlimited file imports, camera AR and local PDF reports, with monthly, yearly or lifetime options.