# PrEP AL vs Dual N

The clearest difference is in-app purchases: PrEP AL at none against Dual N's 2. PrEP AL also leads on ads (none vs shown) and iOS requirement (13.2 vs 17.6). On price and device support there is nothing between them.

Both are free to download. Dual N sells 2 in-app purchases, starting at $3.99 per month. PrEP AL asks for nothing beyond the download.

## The numbers

| Metric | PrEP AL | Dual N |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Size | 2 MB | 27 MB |
| Requires iOS | **13.2** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Alabama Department of Public Health](https://appshunter.io/developer/1440330854) | [Konstanty Koszewski](https://appshunter.io/developer/1871696981) |

## What reviewers say

### PrEP AL

[App page](https://appshunter.io/ios/app/prep-al/id1506833788)

**Features:** macOS Compatibility

**In-app purchases:** none


### Dual N

[App page](https://appshunter.io/ios/app/dual-n-back-memory-trainer/id6759211886)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Dual N-back Monthly Premium | $3.99 | per month |
| Dual N-back Yearly Premium | $29.99 | per year |


## Frequently asked questions

### Is PrEP AL free?

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

### Is Dual N free?

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

### Do PrEP AL or Dual N have ads?

Dual N shows ads; PrEP AL does not.

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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.*