STEP Viewer vs Stairstep
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
STEP Viewer
Read full descriptionHide full description
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.
Stairstep
View and inspect 3D models in STEP file format. Explore models with intuitive orbit, pan, and zoom controls, aided by a reference grid and scale bar. Access detailed geometry information including vertices, triangles, and dimensions.
- 3D model viewing
- Orbit, pan, and zoom controls
- Reference grid
- Scale bar for size tracking
- Geometry inspector
- Dimension reporting
Read full descriptionHide full description
Stairs views STEP files. Open a model and inspect it in 3D — orbit, pan, and zoom, with a reference grid and a scale bar to keep track of size. Drag to orbit the model and scroll or pinch to zoom; the scale bar updates to match. The toolbar fits the model back into view and reveals an inspector that reports the geometry — vertices, triangles, materials, and overall dimensions.
Screenshots
Verdict
The clearest difference is rating: Stairstep at 5.0 against STEP Viewer's 1.0. STEP Viewer's advantage is update cadence (every 5 days vs monthly) and iOS requirement (13.0 vs 26.0). On price, ratings volume, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Stairstep holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
STEP Viewer ships an update every 5 days, Stairstep monthly. Both last shipped on October 24, 2026.
| Parameter | STEP Viewer | Stairstep |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 5.0 (1 ratings) — better |
| Number of ratings | 1 | 1 |
| Update frequency | Every 5 days — better | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 13.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 61 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Smart Cube Labs Co., Ltd. | Twarge LLC |
In-app purchases
STEP Viewer
No in-app purchases
Stairstep
No in-app purchases
