# STRUCT vs PassStamp

The clearest difference is rating: STRUCT at 5.0 against PassStamp's 2.0. STRUCT also leads on in-app purchases (none vs 10). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. PassStamp sells 10 one-off in-app purchases. STRUCT asks for nothing beyond the download.

STRUCT holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Both ship on a similar rhythm, roughly every 4 weeks. The most recent releases landed on October 16, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | STRUCT | PassStamp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/struct-ar/id6476420507/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/passstamp-pe-and-fe-exam-prep/id6774922905/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | Every 4 weeks |
| Monetization | Free | Free |
| Size | 165 MB | 42 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [UVA Apps, LLC](https://appshunter.io/developer/881105800) | [Ingenio Productions LLC](https://appshunter.io/developer/1249919346) |

## What reviewers say

### 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


### PassStamp

[App page](https://appshunter.io/ios/app/passstamp-pe-and-fe-exam-prep/id6774922905)

Prepare for PE and FE engineering exams with NCEES-aligned practice questions and mock exams. This app offers a unique readiness score, tracks weak spots, and covers multiple engineering disciplines. Study effectively in short bursts with a one-time purchase.

**Highlights:** NCEES-aligned practice questions, Separate exam and practice question banks, Trustworthy readiness score, Targeted study sessions, Covers multiple FE and PE disciplines, Full-length exam simulator, Offline functionality

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FE Civil Exam Prep | $24.99 | one-time |
| FE Environmental Exam Prep | $24.99 | one-time |
| FE Chemical Exam Prep | $24.99 | one-time |
| FE Industrial & Systems Prep | $24.99 | one-time |
| PE Mech: Machine Design | $34.99 | one-time |
| PE Civil: Structural Exam Prep | $34.99 | one-time |
| PE Civil: WRE Exam Prep | $34.99 | one-time |
| PE Civil: Construction Exam Prep | $34.99 | one-time |
| PE Civil: Geotechnical Exam Prep | $34.99 | one-time |
| PE Civil: Transportation Exam Prep | $34.99 | one-time |


## Frequently asked questions

### Is STRUCT free?

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

### Is PassStamp free?

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

### Which has better reviews, STRUCT or PassStamp?

STRUCT is rated higher. STRUCT averages 5.0 out of 5 from 1 ratings, while PassStamp averages 2.0 from 1 ratings.

### Do STRUCT or PassStamp have ads?

Neither STRUCT nor PassStamp shows ads.

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

STRUCT ships an update every 4 weeks, and PassStamp every 4 weeks. Most recently, STRUCT was updated on October 16, 2026 and PassStamp on November 5, 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.*