# E4B vs Osmosis and Diffusion

The clearest difference is in-app purchases: Osmosis and Diffusion at none against E4B's 3. Osmosis and Diffusion also leads on iOS requirement (12.0 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. E4B sells 3 in-app purchases, starting at $1.99 per month. Osmosis and Diffusion asks for nothing beyond the download.

## The numbers

| Metric | E4B | Osmosis and Diffusion |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | — |
| Size | 45 MB | 27 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CARLOS GOMES DE OLIVEIRA](https://appshunter.io/developer/1576926646) | [Science Education Institute](https://appshunter.io/developer/1439710468) |

## What reviewers say

### E4B

[App page](https://appshunter.io/ios/app/e4b/id1599766670)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Assinatura Mensal | $1.99 | per month |
| Assinatura Semestral | $9.99 | per 6 months |
| Assinatura Anual | $14.99 | per year |


### Osmosis and Diffusion

[App page](https://appshunter.io/ios/app/osmosis-and-diffusion/id6744108717)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is E4B free?

E4B is free to download, with in-app purchases available.

### Is Osmosis and Diffusion free?

Osmosis and Diffusion is free to download, with no in-app purchases.

### Do E4B or Osmosis and Diffusion have ads?

Neither E4B nor Osmosis and Diffusion shows ads.

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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.*