Can I open a STEP file on Android?

Yes. Install Open3D Viewer from Google Play. It reads .step, .stp, .iges and .igs directly on-device.

Do I need CAD software?

No. Open3D tessellates the STEP file on-device. Free.

Does the file get uploaded?

No. Parsing runs on the phone; the file never leaves the app sandbox.

Android · CAD

STEP viewer for Android.

Free on Google Play. Open .step, .stp, .iges and .igs files straight from Drive, Gmail, WhatsApp, Slack or a browser download. On-device tessellation, no CAD subscription, no cloud upload.

Get on Google Play → STEP viewer (all platforms)

What you can do with it

Open .step / .stp / .iges / .igs from any source that lands the file on the phone
Orbit and pinch-zoom through the assembly
Measure real distances in mm, cm or inches
Cross-section any axis to inspect internal features
Solid, wireframe, X-ray render modes
Screenshot to share back in the same thread the file arrived in

When it matters more than a laptop

The two workflows that keep coming up: field technicians sanity-checking a supplier part on-site before installation, and engineers doing a rev review from a phone during a train commute or between meetings. Neither wants to wait for a laptop and neither wants to feed confidential geometry to a browser-based converter.

Open3D on Android sits inside those two workflows without asking anything except which file.

Privacy

Android app sandboxing plus on-device parsing means the STEP file is only accessible to Open3D, and no bytes are sent off-device. Ads (banner + interstitial) are served through Google Admob for the free tier; they don't touch the file.

FAQ

Which STEP files does it read?

AP203 and AP214 — the two most widely-exported STEP schemas. AP242 loads too, but PMI annotations are best-effort.

How large a STEP file can I open on Android?

Small parts and single bodies open instantly on any modern phone. Large multi-hundred-body assemblies work on Pixel 6 / Galaxy S22 and up. Very large aerospace assemblies may not fit into phone memory.

Does it edit STEP files?

No. Viewer only — orbit, measure, section, screenshot. Editing needs a CAD tool (Fusion 360, SolidWorks, FreeCAD).

Is it free?

Yes, ad-supported on Android. No IAP required.