# Diffusion and osmosis vs DOST SIMATAR

The clearest difference is price: DOST SIMATAR at Free against Diffusion and osmosis's $0.99. DOST SIMATAR also leads on update cadence (weekly 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.

DOST SIMATAR 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, DOST SIMATAR weekly. The most recent releases landed on October 12, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Diffusion and osmosis | DOST SIMATAR |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 30 months | **Weekly** |
| Size | 40 MB | 289 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) | [Science Education Institute](https://appshunter.io/developer/1439710468) |

## 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


### DOST SIMATAR

[App page](https://appshunter.io/ios/app/dost-simatar-matter/id6745665601)

**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 DOST SIMATAR free?

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

### Do Diffusion and osmosis or DOST SIMATAR have ads?

Neither Diffusion and osmosis nor DOST SIMATAR shows ads.

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

Diffusion and osmosis ships an update every 30 months, and DOST SIMATAR weekly. Most recently, Diffusion and osmosis was updated on October 12, 2026 and DOST SIMATAR on October 10, 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.*