STEP Viewer vs CADDaddy

STEP Viewer opens STEP (.step, .stp) CAD files in 3D on your phone. No desktop CAD software needed. Everything is free. There are no in-app purchases. Credits only skip the ad; without credits you can still open every file after watching a short ad. Key features * Open .step and .stp files straight from your file manager - just tap the file * Measure your model: a bounding box with all three side lengths, in mm or m * Six fixed views (front, right, back, left, top, bottom), plus pinch to zoom, pan and rotate * Save the converted model as GLB whenever you need it * Large files show the estimated time and memory before conversion starts, and progress while it runs * If a file cannot be opened, the app tells you why instead of failing silently * Available in 12 languages, following your device settings Supported formats * Input: .stp, .step (STEP AP203, AP214) * Output: .glb (glTF Binary) How to use 1. Tap a .step file in your file manager, or open the app and tap the folder icon 2. Wait for the conversion - large files show progress and an estimate 3. Drag to rotate, pinch to zoom, tap the view button to switch sides License This app uses Open CASCADE Technology (LGPL-2.1). https://www.opencascade.com For questions or bug reports, please contact us by email.

CADDaddy is a fast, native 3D CAD viewer for iPhone and iPad. Open STEP, DWG, DXF, FBX, 3MF, PLY, STL, IGES and OBJ files in seconds — no account required, no subscription, no features locked behind a second paywall. Built natively for Apple Silicon, CADDaddy renders complex assemblies smoothly using Metal. Every part keeps its colour. Every gesture works the way you'd expect on iPhone and iPad. WHAT YOU CAN DO - Open files from Files, Mail, AirDrop, or any share sheet - View assemblies in full colour where each part renders individually - Switch between shaded, wireframe, and solid display modes - Toggle between perspective and orthographic projection - Slice through any model with section planes on X, Y and Z axes - Measure point-to-point distances with vertex snapping - Export to STL, GLB or USDZ - View any USDZ export in AR — place a model on your desk and walk around it WORKS THE WAY AN iOS APP SHOULD Native touch gestures. One-finger orbit, two-finger pan, pinch to zoom. Every control is built for thumbs and fingers, not retrofitted from a desktop UI. VIEW IN AR Tap to send any model to AR Quick Look. See your part at full scale on the floor, on your desk, in your workshop wherever you need to check it before you commit. ONE PURCHASE. THREE PLATFORMS. Buy once and CADDaddy unlocks on iPhone, iPad and Mac. No account, no cloud sync, no analytics — your files stay on your device. WHO IT'S FOR Engineers checking geometry on the go. Clients reviewing a design without needing a CAD licence. 3D printing enthusiasts inspecting files before they slice. Machinists verifying a part before they cut. If you've ever tried to open a CAD file on your iPhone and hit a login screen, a subscription prompt, or a crash, CADDaddy is the app you were looking for.