# STEP Viewer vs STP One

The clearest difference is in-app purchases: STEP Viewer at none against STP One's 2. STEP Viewer also leads on iOS requirement (13.0 vs 16.4). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. STP One sells 2 in-app purchases, starting at $9.99 per month. STEP Viewer asks for nothing beyond the download.

STEP Viewer ships an update every 5 days, STP One every 6 days. The most recent releases landed on October 30, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | STEP Viewer | STP One |
| --- | --- | --- |
| 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** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 6 days |
| Monetization | Free | — |
| Size | 61 MB | 13 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) | [JAEYUN HWANG](https://appshunter.io/developer/6799562363) |

## 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


### STP One

[App page](https://appshunter.io/ios/app/stp-one-step-3d-viewer/id6802912144)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 스텝원 Pro 월간 | $9.99 | per month |
| 스텝원 Pro 연간 | $69.99 | per year |


## Frequently asked questions

### Is STEP Viewer free?

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

### Is STP One free?

STP One is free to download, with in-app purchases available.

### Do STEP Viewer or STP One have ads?

Neither STEP Viewer nor STP One shows ads.

### Which is updated more often, STEP Viewer or STP One?

STEP Viewer ships an update every 5 days, and STP One every 6 days. Most recently, STEP Viewer was updated on October 30, 2026 and STP One on November 10, 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.*