# 3D Model Viewer vs STEP Viewer

The clearest difference is rating: 3D Model Viewer at 3.5 against STEP Viewer's 1.0. 3D Model Viewer also leads on ratings volume (11 vs 1). STEP Viewer's advantage is in-app purchases (none vs 4) and iOS requirement (13.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 3D Model Viewer sells 4 in-app purchases, starting at $2.99 per 7 days. STEP Viewer asks for nothing beyond the download.

3D Model Viewer holds the better App Store score, 3.5 against 1.0. That said, the two scores are not equally well evidenced: 3D Model Viewer has 11 ratings behind it against 1, so its average is the more settled of the two.

3D Model Viewer ships an update weekly, STEP Viewer every 5 days. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | 3D Model Viewer | STEP Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.5 (11 ratings)](https://appshunter.io/ios/app/3d-model-viewer-stl-and-usdz/id1587642013/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/step-viewer/id6756539299/reviews) |
| Number of ratings | **11** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | **Every 5 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 15 MB | 61 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ariel Ortiz](https://appshunter.io/developer/1583119689) | [Smart Cube Labs Co., Ltd.](https://appshunter.io/developer/1456342688) |

## What reviewers say

### 3D Model Viewer

[App page](https://appshunter.io/ios/app/3d-model-viewer-stl-and-usdz/id1587642013)

Easily view and interact with 3D models in various formats like USDZ, STL, and OBJ. Explore your designs with intuitive gestures, high-performance rendering, and augmented reality capabilities. Record animations of your models for sharing.

**Highlights:** View USDZ, STL, OBJ, PLY files, Intuitive gesture controls, High-performance rendering, Augmented Reality (AR) visualization, Record rotation animations, Supports OBJ with textures

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access | $2.99 | per 7 days |
| All Access | $3.99 | per month |
| All Access | $14.99 | per year |
| One-time payment | $3.99 | one-time |


### STEP Viewer

[App page](https://appshunter.io/ios/app/step-viewer/id6756539299)

View and interact with 3D CAD files directly on your mobile device. Measure dimensions, rotate, zoom, and save models in a common format without needing desktop software.

**Highlights:** Open STEP files from file manager, 3D model measurement tools, Six fixed views, Pinch to zoom, pan, and rotate, Save as GLB, Progress indicator for large files, Multilingual support

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is 3D Model Viewer free?

3D Model Viewer is free to download, with in-app purchases available.

### Is STEP Viewer free?

STEP Viewer is free to download, with no in-app purchases.

### Which has better reviews, 3D Model Viewer or STEP Viewer?

3D Model Viewer is rated higher. 3D Model Viewer averages 3.5 out of 5 from 11 ratings, while STEP Viewer averages 1.0 from 1 ratings.

### Do 3D Model Viewer or STEP Viewer have ads?

Neither 3D Model Viewer nor STEP Viewer shows ads.

### Which is updated more often, 3D Model Viewer or STEP Viewer?

3D Model Viewer ships an update weekly, and STEP Viewer every 5 days. Most recently, 3D Model Viewer was updated on November 3, 2026 and STEP Viewer on October 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*