# Human Digestive System vs Ecosystems are Interconnected

The clearest difference is price: Ecosystems are Interconnected at Free against Human Digestive System's $0.99. Ecosystems are Interconnected also leads on device support (3 vs 1). Human Digestive System's advantage is update cadence (every 18 months vs every 63 months). On ads, in-app purchases and iOS requirement there is nothing between them.

Ecosystems are Interconnected 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, Ecosystems are Interconnected every 63 months. The most recent releases landed on October 1, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Human Digestive System | Ecosystems are Interconnected |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 18 months** | Every 63 months |
| Size | 401 MB | 86 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [www.ajaxmediatech.com](https://appshunter.io/developer/973768003) | [Science Education Institute](https://appshunter.io/developer/1439710468) |

## What reviewers say

### Human Digestive System

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Ecosystems are Interconnected

[App page](https://appshunter.io/ios/app/ecosystems-are-interconnected/id1439729976)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Human Digestive System free?

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

### Is Ecosystems are Interconnected free?

Ecosystems are Interconnected is free to download, with no in-app purchases.

### Do Human Digestive System or Ecosystems are Interconnected have ads?

Neither Human Digestive System nor Ecosystems are Interconnected shows ads.

### Which is updated more often, Human Digestive System or Ecosystems are Interconnected?

Human Digestive System ships an update every 18 months, and Ecosystems are Interconnected every 63 months. Most recently, Human Digestive System was updated on October 1, 2026 and Ecosystems are Interconnected on October 12, 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.*