# StrucMaster HD vs Polygon

The clearest difference is rating: Polygon at 3.0 against StrucMaster HD's 2.3. Polygon also leads on update cadence (weekly vs every 6 months). StrucMaster HD's advantage is monetization model (free vs freemium) and ratings volume (3 vs 1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. StrucMaster HD 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.

Polygon holds the better App Store score, 3.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

StrucMaster HD ships an update every 6 months, Polygon weekly. The most recent releases landed on October 10, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | StrucMaster HD | Polygon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/strucmaster-hd/id1091326709/reviews) | **[3.0 (1 ratings)](https://appshunter.io/ios/app/polygon-inertia-centroid/id6469235285/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | **Free** | Freemium |
| Size | 86 MB | 29 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [颖达 陈](https://appshunter.io/developer/1058507663) | [Adrian Caballero](https://appshunter.io/developer/1635287590) |

## What reviewers say

### StrucMaster HD

[App page](https://appshunter.io/ios/app/strucmaster-hd/id1091326709)

This app allows users to define and analyze structural mechanics problems on their iPad. It offers powerful functions for internal force diagrams, dynamics, influence lines, and stability analysis, with detailed solving steps provided by AI. Users can create complex structures with non-integer element lengths.

**Highlights:** Define custom structures, Internal force diagram analysis, Dynamics and stability analysis, Influence line calculations, AI-powered detailed solving steps, MultiSelect command for complex structures, Offline analysis

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Advanced Function Forever | $3.99 | 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 StrucMaster HD free?

StrucMaster HD 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, StrucMaster HD or Polygon?

Polygon is rated higher. StrucMaster HD averages 2.3 out of 5 from 3 ratings, while Polygon averages 3.0 from 1 ratings.

### Do StrucMaster HD or Polygon have ads?

Neither StrucMaster HD nor Polygon shows ads.

### Which is updated more often, StrucMaster HD or Polygon?

StrucMaster HD ships an update every 6 months, and Polygon weekly. Most recently, StrucMaster HD was updated on October 10, 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.*