# STEP Viewer vs UnlockedPerformanceApp

The clearest difference is update cadence: UnlockedPerformanceApp at every 2 days against STEP Viewer's every 5 days. STEP Viewer's advantage is iOS requirement (13.0 vs 16.4). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

STEP Viewer ships an update every 5 days, UnlockedPerformanceApp every 2 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | STEP Viewer | UnlockedPerformanceApp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/step-viewer/id6756539299/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 2 days** |
| Monetization | Free | — |
| Size | 61 MB | 61 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Smart Cube Labs Co., Ltd.](https://appshunter.io/developer/1456342688) | [FRANCIS JUNGWON LEE](https://appshunter.io/developer/6818861205) |

## What reviewers say

### 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


### UnlockedPerformanceApp

[App page](https://appshunter.io/ios/app/unlockedperformanceapp/id6818941352)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is STEP Viewer free?

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

### Is UnlockedPerformanceApp free?

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

### Do STEP Viewer or UnlockedPerformanceApp have ads?

Neither STEP Viewer nor UnlockedPerformanceApp shows ads.

### Which is updated more often, STEP Viewer or UnlockedPerformanceApp?

STEP Viewer ships an update every 5 days, and UnlockedPerformanceApp every 2 days. Most recently, STEP Viewer was updated on October 30, 2026 and UnlockedPerformanceApp on October 31, 2026.

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