# TopOpt 3D vs STRUCT

The clearest difference is rating: STRUCT at 5.0 against TopOpt 3D's 3.7. TopOpt 3D's advantage is ratings volume (3 vs 1) and iOS requirement (11.0 vs 15.0). On price, update cadence, 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.

STRUCT holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

TopOpt 3D ships an update every 6 weeks, STRUCT every 4 weeks. The most recent releases landed on October 4, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | TopOpt 3D | STRUCT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/topopt-3d/id881472301/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/struct-ar/id6476420507/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 4 weeks** |
| Monetization | Free | Free |
| Size | 103 MB | 165 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DTU Mechanical Engineering](https://appshunter.io/developer/507453160) | [UVA Apps, LLC](https://appshunter.io/developer/881105800) |

## What reviewers say

### TopOpt 3D

[App page](https://appshunter.io/ios/app/topopt-3d/id881472301)

Perform 3D structural optimization using topology optimization on your iPad or iPhone. Adjust loads, supports, volume fractions, and grid sizes to observe design evolution. Experiment with different parameters to discover new minimums.

**Highlights:** 3D topology optimization, Adjustable loads and supports, Variable volume fractions, Experiment with grid sizes, Design evolution visualization

**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 TopOpt 3D free?

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

### Is STRUCT free?

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

### Which has better reviews, TopOpt 3D or STRUCT?

STRUCT is rated higher. TopOpt 3D averages 3.7 out of 5 from 3 ratings, while STRUCT averages 5.0 from 1 ratings.

### Do TopOpt 3D or STRUCT have ads?

Neither TopOpt 3D nor STRUCT shows ads.

### Which is updated more often, TopOpt 3D or STRUCT?

TopOpt 3D ships an update every 6 weeks, and STRUCT every 4 weeks. Most recently, TopOpt 3D was updated on October 4, 2026 and STRUCT on September 30, 2026.

---

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