# Mohr's CSA vs Intergalactic Solar System

The clearest difference is price: Intergalactic Solar System at Free against Mohr's CSA's $2.99. Intergalactic Solar System also leads on update cadence (monthly vs every 3 months) and iOS requirement (13.0 vs 26.5). Mohr's CSA's advantage is in-app purchases (none vs 1) and review sentiment (100% vs 70%). On ads and device support there is nothing between them.

Intergalactic Solar System is free to download; Mohr's CSA costs $2.99 up front. Intergalactic Solar System sells 1 one-off in-app purchase. Mohr's CSA asks for nothing beyond the download.

Mohr's CSA ships an update every 3 months, Intergalactic Solar System monthly. The most recent releases landed on September 22, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Mohr's CSA | Intergalactic Solar System |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[4.0 (25 ratings)](https://appshunter.io/ios/app/intergalactic-solar-system/id1505399254/reviews)** |
| Number of ratings | — | **25** |
| Positive reviews | **100.0% of reviews** | 70.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 13 MB | 355 MB |
| Requires iOS | 26.5 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [DRH YAZILIM VE MUHENDISLIK HIZMETLERI LTD STI](https://appshunter.io/developer/914295588) | [Intergalactic Education LLC](https://appshunter.io/developer/1364648815) |

## What reviewers say

### Mohr's CSA

[App page](https://appshunter.io/ios/app/mohrs-csa/id914295585)

This application provides an interactive tool for visualizing and analyzing stress states. It offers 2D and 3D stress analysis with detailed graphical representations and allows for direct stress transformations on Mohr's Circle. Users can also access a built-in formula sheet, export results to PDF, and save their input data.

**Highlights:** Interactive Mohr's Circle, 2D & 3D Stress Analysis, Stress Transformations, Built-in Formula Sheet, Export Results to PDF, Save & Restore Data

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

**In-app purchases:** none


### Intergalactic Solar System

[App page](https://appshunter.io/ios/app/intergalactic-solar-system/id1505399254)

Explore planets, moons, and countries in this space simulator mini-game. Learn astronomy and geography aligned with next-generation science standards. Discover the Milky Way galaxy and assess your knowledge through engaging gameplay.

**Highlights:** Planet and moon exploration, Country geography learning, Milky Way galaxy view, Common Core aligned curriculum, Proficiency assessment, Engaging gameplay levels

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Access to Full Game | $3.99 | one-time |


## Frequently asked questions

### Is Mohr's CSA free?

Mohr's CSA costs $2.99, with no in-app purchases.

### Is Intergalactic Solar System free?

Intergalactic Solar System is free to download, with in-app purchases available.

### Do Mohr's CSA or Intergalactic Solar System have ads?

Neither Mohr's CSA nor Intergalactic Solar System shows ads.

### Which is updated more often, Mohr's CSA or Intergalactic Solar System?

Mohr's CSA ships an update every 3 months, and Intergalactic Solar System monthly. Most recently, Mohr's CSA was updated on September 22, 2026 and Intergalactic Solar System on October 9, 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.*