# 3D Spatial Viewer vs STEP Reviewer Pro

The clearest difference is in-app purchases: 3D Spatial Viewer at none against STEP Reviewer Pro's 10. STEP Reviewer Pro's advantage is update cadence (every 10 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. STEP Reviewer Pro sells 10 one-off in-app purchases. 3D Spatial Viewer asks for nothing beyond the download.

3D Spatial Viewer ships an update every 3 weeks, STEP Reviewer Pro every 10 days. The most recent releases landed on October 17, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | 3D Spatial Viewer | STEP Reviewer Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 10 days** |
| Size | 13 MB | 41 MB |
| Requires iOS | 27.0 | **26.0** |
| Devices | iPhone, iPad, Vision Pro | **iPhone, iPad, Mac, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [GIOVANNI BATTISTA](https://appshunter.io/developer/6771637292) | [Shanghai Fuwei Information Technology Co., Ltd.](https://appshunter.io/developer/6801400882) |

## What reviewers say

### 3D Spatial Viewer

[App page](https://appshunter.io/ios/app/3d-spatial-viewer/id6772415051)

**Features:** macOS Compatibility, SharePlay

**In-app purchases:** none


### STEP Reviewer Pro

[App page](https://appshunter.io/ios/app/step-reviewer-pro/id6791591460)

**Features:** Family Sharing

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| USDA Export | $6.99 | one-time |
| USDC Export | $6.99 | one-time |
| USDZ Export | $6.99 | one-time |
| Screenshot | $9.99 | one-time |
| Screen Recording | $14.99 | one-time |
| IGES Model Import | $14.99 | one-time |
| STL Export | $19.99 | one-time |
| GLB Export | $19.99 | one-time |
| Exploded View | $24.99 | one-time |
| Unlimited Measurements | $24.99 | one-time |


## Frequently asked questions

### Is 3D Spatial Viewer free?

3D Spatial Viewer is free to download, with no in-app purchases.

### Is STEP Reviewer Pro free?

STEP Reviewer Pro is free to download, with in-app purchases available.

### Do 3D Spatial Viewer or STEP Reviewer Pro have ads?

Neither 3D Spatial Viewer nor STEP Reviewer Pro shows ads.

### Which is updated more often, 3D Spatial Viewer or STEP Reviewer Pro?

3D Spatial Viewer ships an update every 3 weeks, and STEP Reviewer Pro every 10 days. Most recently, 3D Spatial Viewer was updated on October 17, 2026 and STEP Reviewer Pro on October 8, 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.*