# Mohr's Circle vs Polygon

The clearest difference is price: Polygon at Free against Mohr's Circle's $5.99. Polygon also leads on update cadence (weekly vs every 15 months). Mohr's Circle's advantage is in-app purchases (none vs 4) and rating (3.3 vs 3.0). On ads and device support there is nothing between them.

Polygon is free to download; Mohr's Circle costs $5.99 up front. Polygon sells 4 in-app purchases, starting at $2.99 per month. Mohr's Circle asks for nothing beyond the download.

Mohr's Circle holds the better App Store score, 3.3 against 3.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Mohr's Circle ships an update every 15 months, Polygon weekly. The most recent releases landed on October 23, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Mohr's Circle | Polygon |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[3.3 (3 ratings)](https://appshunter.io/ios/app/mohrs-circle/id395110520/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/polygon-inertia-centroid/id6469235285/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | 42.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | **Weekly** |
| Monetization | Paid | **Freemium** |
| Size | 8 MB | 29 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [J.R.Hobbs](https://appshunter.io/developer/395110523) | [Adrian Caballero](https://appshunter.io/developer/1635287590) |

## What reviewers say

### Mohr's Circle

[App page](https://appshunter.io/ios/app/mohrs-circle/id395110520)

This application assists users in performing Mohr's Circle calculations and verifying their diagrams. It offers solutions for 2D plane stress, calculates various stress values, and generates graphical representations of stress states. Users can also share results and store multiple stress states.

**Highlights:** 2D Plane Stress Mohr's Circle Solutions, Max, Min, and Shear Stress Calculations, Principal Stress Plane Angle, Mohr's Circle Diagram, Stress State Rotation Views, Shareable Results, Unit Conversion (English/Metric)

**Features:** Vision Pro support

**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 Mohr's Circle free?

Mohr's Circle costs $5.99, with no in-app purchases.

### Is Polygon free?

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

### Which has better reviews, Mohr's Circle or Polygon?

Mohr's Circle is rated higher. Mohr's Circle averages 3.3 out of 5 from 3 ratings, while Polygon averages 3.0 from 1 ratings.

### Do Mohr's Circle or Polygon have ads?

Neither Mohr's Circle nor Polygon shows ads.

### Which is updated more often, Mohr's Circle or Polygon?

Mohr's Circle ships an update every 15 months, and Polygon weekly. Most recently, Mohr's Circle was updated on October 23, 2026 and Polygon on September 20, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*