# Free vs STRUCT

The clearest difference is update cadence: Free at every 4 days against STRUCT's every 4 weeks. Free also leads on iOS requirement (11.0 vs 15.0). 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.

Free ships an update every 4 days, STRUCT every 4 weeks. The most recent releases landed on October 27, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Free | STRUCT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/struct-ar/id6476420507/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 4 weeks |
| Monetization | — | Free |
| Size | 602 MB | 165 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Worcester Polytechnic Institute](https://appshunter.io/developer/721911531) | [UVA Apps, LLC](https://appshunter.io/developer/881105800) |

## What reviewers say

### Free

[App page](https://appshunter.io/ios/app/free-body-diagram/id6471265397)

**In-app purchases:** none


### STRUCT

[App page](https://appshunter.io/ios/app/struct-ar/id6476420507)

Explore structural engineering concepts in augmented reality. Visualize how beams and bridges react to loads in your own space, offering an interactive and engaging learning experience for students. No complex setup required, just your device and camera.

**Highlights:** Augmented reality visualization, Interactive load simulations, Pre-loaded finite element models, Classroom and independent learning tool, 3D model interaction, Camera access for AR

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Free free?

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

### Is STRUCT free?

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

### Do Free or STRUCT have ads?

Neither Free nor STRUCT shows ads.

### Which is updated more often, Free or STRUCT?

Free ships an update every 4 days, and STRUCT every 4 weeks. Most recently, Free was updated on October 27, 2026 and STRUCT on October 16, 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.*