# Radioactivity vs CloudLabs Heat Capacity

The clearest difference is price: CloudLabs Heat Capacity at Free against Radioactivity's $0.99. CloudLabs Heat Capacity also leads on device support (3 vs 1) and iOS requirement (9.0 vs 12.0). On update cadence, ads and in-app purchases there is nothing between them.

CloudLabs Heat Capacity 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, CloudLabs Heat Capacity every 28 months. The most recent releases landed on October 3, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Radioactivity | CloudLabs Heat Capacity |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 36 months | **Every 28 months** |
| Size | 52 MB | 72 MB |
| Requires iOS | 12.0 | **9.0** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [www.ajaxmediatech.com](https://appshunter.io/developer/973768003) | [Jiovany Orozco](https://appshunter.io/developer/1114670847) |

## What reviewers say

### Radioactivity

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

**Features:** macOS Compatibility

**In-app purchases:** none


### CloudLabs Heat Capacity

[App page](https://appshunter.io/ios/app/cloudlabs-heat-capacity/id1596373262)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Radioactivity free?

Radioactivity costs $0.99, with no in-app purchases.

### Is CloudLabs Heat Capacity free?

CloudLabs Heat Capacity is free to download, with no in-app purchases.

### Do Radioactivity or CloudLabs Heat Capacity have ads?

Neither Radioactivity nor CloudLabs Heat Capacity shows ads.

### Which is updated more often, Radioactivity or CloudLabs Heat Capacity?

Radioactivity ships an update every 36 months, and CloudLabs Heat Capacity every 28 months. Most recently, Radioactivity was updated on October 3, 2026 and CloudLabs Heat Capacity on October 27, 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.*