# Structural Engineering lite vs Polygon

The clearest difference is rating: Structural Engineering lite at 4.2 against Polygon's 3.0. Structural Engineering lite also leads on ratings volume (19 vs 1). Polygon's advantage is ads (none vs shown) and update cadence (weekly vs every 6 months). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Structural Engineering lite sells 1 one-off in-app purchase and Polygon sells 4 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Structural Engineering lite holds the better App Store score, 4.2 against 3.0. That said, the two scores are not equally well evidenced: Structural Engineering lite has 19 ratings behind it against 1, so its average is the more settled of the two.

Structural Engineering lite ships an update every 6 months, Polygon weekly. The most recent releases landed on September 18, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Structural Engineering lite | Polygon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (19 ratings)](https://appshunter.io/ios/app/structural-engineering-lite/id638690043/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/polygon-inertia-centroid/id6469235285/reviews) |
| Number of ratings | **19** | 1 |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 6 MB | 29 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) | [Adrian Caballero](https://appshunter.io/developer/1635287590) |

## What reviewers say

### Structural Engineering lite

[App page](https://appshunter.io/ios/app/structural-engineering-lite/id638690043)

This app provides engineers with essential structural formulas and calculations for civil construction projects. It offers instant results, demand/capacity checks, and a built-in database of materials and sections, all accessible on mobile devices.

**Highlights:** 59 structural formulas (AISC/ACI), Instant demand/capacity checks, Built-in AISC section database, Material and code references, USCS & SI unit support, Pass/Fail visual indicator

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Structural Engineering Calc. | $5.99 | one-time |


### Polygon

[App page](https://appshunter.io/ios/app/polygon-inertia-centroid/id6469235285)

Calculate complex properties of any polygonal figure, including centroids, moments of inertia, and perimeter. Simply input vertex coordinates for instant results, saving significant time on tedious calculations.

**Highlights:** Polygon Centroids, Moments of Inertia (Ix, Iy, Ixy), Polar Moment of Inertia, Radius of Gyration, Principal Moments of Inertia, Area and Perimeter, Side Lengths, Hollow Sections

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Access | $2.99 | per month |
| Pro Access | $4.99 | per 6 months |
| Pro Access | $6.99 | per year |
| Pro Access | $9.99 | one-time |


## Frequently asked questions

### Is Structural Engineering lite free?

Structural Engineering lite is free to download, with in-app purchases available.

### Is Polygon free?

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

### Which has better reviews, Structural Engineering lite or Polygon?

Structural Engineering lite is rated higher. Structural Engineering lite averages 4.2 out of 5 from 19 ratings, while Polygon averages 3.0 from 1 ratings.

### Do Structural Engineering lite or Polygon have ads?

Structural Engineering lite shows ads; Polygon does not.

### Which is updated more often, Structural Engineering lite or Polygon?

Structural Engineering lite ships an update every 6 months, and Polygon weekly. Most recently, Structural Engineering lite was updated on September 18, 2026 and Polygon on September 20, 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.*