# Diffusion and osmosis vs ChemARise

The clearest difference is price: ChemARise at Free against Diffusion and osmosis's $0.99. ChemARise also leads on update cadence (every 4 months vs every 30 months). Diffusion and osmosis's advantage is iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

ChemARise is free to download; Diffusion and osmosis costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Diffusion and osmosis ships an update every 30 months, ChemARise every 4 months. The most recent releases landed on October 12, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Diffusion and osmosis | ChemARise |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 30 months | **Every 4 months** |
| Size | 40 MB | 299 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [www.ajaxmediatech.com](https://appshunter.io/developer/973768003) | [Roy Lavendomme](https://appshunter.io/developer/1700693660) |

## What reviewers say

### Diffusion and osmosis

[App page](https://appshunter.io/ios/app/diffusion-and-osmosis/id1199769507)

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

**In-app purchases:** none


### ChemARise

[App page](https://appshunter.io/ios/app/chemarise/id6459995288)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Diffusion and osmosis free?

Diffusion and osmosis costs $0.99, with no in-app purchases.

### Is ChemARise free?

ChemARise is free to download, with no in-app purchases.

### Do Diffusion and osmosis or ChemARise have ads?

Neither Diffusion and osmosis nor ChemARise shows ads.

### Which is updated more often, Diffusion and osmosis or ChemARise?

Diffusion and osmosis ships an update every 30 months, and ChemARise every 4 months. Most recently, Diffusion and osmosis was updated on October 12, 2026 and ChemARise 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.*