# Human Digestive System vs Real Solar System

The clearest difference is price: Real Solar System at Free against Human Digestive System's $0.99. Real Solar System also leads on update cadence (monthly vs every 18 months). Human Digestive System's advantage is iOS requirement (12.0 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

Real Solar System is free to download; Human Digestive System costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Human Digestive System ships an update every 18 months, Real Solar System monthly. The most recent releases landed on October 1, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Human Digestive System | Real Solar System |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Monthly** |
| Size | 401 MB | 302 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [www.ajaxmediatech.com](https://appshunter.io/developer/973768003) | [Masaya Nagaoka](https://appshunter.io/developer/1698240335) |

## What reviewers say

### Human Digestive System

[App page](https://appshunter.io/ios/app/human-digestive-system/id983535092)

**Features:** macOS Compatibility

**In-app purchases:** none


### Real Solar System

[App page](https://appshunter.io/ios/app/real-solar-system/id6475644962)

**In-app purchases:** none


## Frequently asked questions

### Is Human Digestive System free?

Human Digestive System costs $0.99, with no in-app purchases.

### Is Real Solar System free?

Real Solar System is free to download, with no in-app purchases.

### Do Human Digestive System or Real Solar System have ads?

Neither Human Digestive System nor Real Solar System shows ads.

### Which is updated more often, Human Digestive System or Real Solar System?

Human Digestive System ships an update every 18 months, and Real Solar System monthly. Most recently, Human Digestive System was updated on October 1, 2026 and Real Solar System on October 7, 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.*