# CSiSections vs Polygon

The clearest difference is in-app purchases: CSiSections at none against Polygon's 4. CSiSections also leads on iOS requirement (9.0 vs 17.0). Polygon's advantage is update cadence (weekly vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. Polygon sells 4 in-app purchases, starting at $2.99 per month. CSiSections asks for nothing beyond the download.

CSiSections ships an update monthly, Polygon weekly. The most recent releases landed on August 22, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | CSiSections | Polygon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (1 ratings)](https://appshunter.io/ios/app/polygon-inertia-centroid/id6469235285/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | — | Freemium |
| Size | 12 MB | 29 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Computers and Structures, Inc.](https://appshunter.io/developer/1119970032) | [Adrian Caballero](https://appshunter.io/developer/1635287590) |

## What reviewers say

### CSiSections

[App page](https://appshunter.io/ios/app/csisections/id1344131515)

**In-app purchases:** none


### 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 CSiSections free?

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

### Is Polygon free?

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

### Do CSiSections or Polygon have ads?

Neither CSiSections nor Polygon shows ads.

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

CSiSections ships an update monthly, and Polygon weekly. Most recently, CSiSections was updated on August 22, 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.*