# Radioactivity vs Ecosystems are Interconnected

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

Ecosystems are Interconnected is free to download; Radioactivity costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Radioactivity ships an update every 36 months, Ecosystems are Interconnected every 63 months. The most recent releases landed on October 3, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Radioactivity | Ecosystems are Interconnected |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 36 months** | Every 63 months |
| Size | 52 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

### Radioactivity

[App page](https://appshunter.io/ios/app/radioactivity-physics/id1136130171)

**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 Radioactivity free?

Radioactivity 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 Radioactivity or Ecosystems are Interconnected have ads?

Neither Radioactivity nor Ecosystems are Interconnected shows ads.

### Which is updated more often, Radioactivity or Ecosystems are Interconnected?

Radioactivity ships an update every 36 months, and Ecosystems are Interconnected every 63 months. Most recently, Radioactivity was updated on October 3, 2026 and Ecosystems are Interconnected on October 19, 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.*