# MARVLS vs STRUCT

The clearest difference is update cadence: STRUCT at every 4 weeks against MARVLS's every 4 months. STRUCT also leads on device support (3 vs 1) and iOS requirement (15.0 vs 18.0). On price, ads and in-app purchases there is nothing between them.

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

MARVLS ships an update every 4 months, STRUCT every 4 weeks. The most recent releases landed on October 3, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | MARVLS | 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 months | **Every 4 weeks** |
| Monetization | — | Free |
| Size | 242 MB | 165 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [Michele McColgan](https://appshunter.io/developer/1532617986) | [UVA Apps, LLC](https://appshunter.io/developer/881105800) |

## What reviewers say

### MARVLS

[App page](https://appshunter.io/ios/app/marvls-physics-i-mechanics/id6475370470)

**Features:** macOS Compatibility

**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 MARVLS free?

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

### Is STRUCT free?

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

### Do MARVLS or STRUCT have ads?

Neither MARVLS nor STRUCT shows ads.

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

MARVLS ships an update every 4 months, and STRUCT every 4 weeks. Most recently, MARVLS was updated on October 3, 2026 and STRUCT on September 30, 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.*