# Stairstep — Not terrible STEP File Viewer

> 3D STEP file viewer with inspection tools for geometry and dimensions. (iPhone/iPad app by Twarge LLC.)

- Source: https://appshunter.io/ios/app/stairstep/id6781493653 (this page in markdown: same URL + `.md`)
- Developer: [Twarge LLC](https://appshunter.io/developer/6781456673)
- Category: Productivity
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 26.0 · 23 MB
- Languages: American English
- Released: 2026-06-22
- Data updated: 2026-08-03
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/stairstep/id6781493653/reviews.md

## What is Stairstep?

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.

## Key features

- 3D model viewing
- Orbit, pan, and zoom controls
- Reference grid
- Scale bar for size tracking
- Geometry inspector
- Dimension reporting


## Frequently asked questions about Stairstep

### What devices does Stairstep support?

Stairstep is available on Mac, iPhone, and iPad, offering cross-platform compatibility for viewing your 3D models.

### How do I navigate models in Stairstep?

You can drag your finger to orbit the model, and use scrolling or pinching gestures to zoom in and out. The scale bar dynamically updates to reflect the current view.

### What kind of geometry information can I see in Stairstep?

Stairstep's inspector provides detailed geometry data, including the number of vertices and triangles, material information, and overall dimensions of the model.

### Is Stairstep suitable for professional use?

With its ability to inspect detailed geometry and dimensions, Stairstep is a useful tool for professionals who need to review 3D models on the go.

### How often is Stairstep updated?

The app was last updated on June 27, 2026, indicating active development and potential for future improvements and bug fixes.

### What is the age rating for Stairstep?

Stairstep has an age rating of 4+, making it suitable for a wide range of users, including younger individuals who may be learning about 3D modeling.

### Does Stairstep have ads?

No, Stairstep does not contain advertisements, providing an uninterrupted viewing experience for your 3D models.

## Version history (last 3 releases)

### 1.2 — 2026-07-30

- Add cross section and measurement tools
- Switch to realitykit

### 1.1 — 2026-06-27

- minor bug fixes

### 1.0 — 2026-06-25

No release notes.

## More apps by Twarge LLC

- [HighDeF](https://appshunter.io/ios/app/highdef/id6781456671)
- [DeXeF](https://appshunter.io/ios/app/dexef/id6781488401)
- [Typeset Typst](https://appshunter.io/ios/app/typeset-typst/id6781494180)
- [Geomagnetic Observatory](https://appshunter.io/ios/app/geomagnetic-observatory/id6783194320)

All apps by Twarge LLC: https://appshunter.io/developer/6781456673

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-03.*