# StrucMaster vs Polygon

The clearest difference is update cadence: Polygon at weekly against StrucMaster's every 14 months. StrucMaster's advantage is ratings volume (3 vs 1) and iOS requirement (8.0 vs 17.0). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. StrucMaster 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.

On the App Store both sit at effectively the same score — 3.0 for StrucMaster against 3.0 for Polygon. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

StrucMaster ships an update every 14 months, Polygon weekly. The most recent releases landed on October 7, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | StrucMaster | Polygon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (3 ratings)](https://appshunter.io/ios/app/strucmaster/id1095033470/reviews) | [3.0 (1 ratings)](https://appshunter.io/ios/app/polygon-inertia-centroid/id6469235285/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 14 months | **Weekly** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 101 MB | 29 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | 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

[App page](https://appshunter.io/ios/app/strucmaster/id1095033470)

This app allows users to define and analyze structural mechanics problems. It offers powerful functions for internal force diagrams, dynamics, influence lines, and stability analysis, with detailed solving steps provided by artificial intelligence. Users can build 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, Non-integer element length support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Advanced Functions 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 free?

StrucMaster 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 or Polygon?

StrucMaster and Polygon are both rated 3.0 out of 5 on the App Store, from 3 and 1 ratings respectively.

### Do StrucMaster or Polygon have ads?

Neither StrucMaster nor Polygon shows ads.

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

StrucMaster ships an update every 14 months, and Polygon weekly. Most recently, StrucMaster was updated on October 7, 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.*