# PreNumbers vs DysViewer

The clearest difference is in-app purchases: DysViewer at none against PreNumbers's 1. DysViewer also leads on device support (3 vs 1). PreNumbers's advantage is iOS requirement (12.0 vs 15.0). On price and ads there is nothing between them.

Both are free to download. PreNumbers sells 1 one-off in-app purchase. DysViewer asks for nothing beyond the download.

## The numbers

| Metric | PreNumbers | DysViewer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 months | — |
| Size | 42 MB | 49 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [IntegraTools GmbH](https://appshunter.io/developer/618103816) | [Amicale du Personel de l'institut pour Deficients Visuels](https://appshunter.io/developer/563144151) |

## What reviewers say

### PreNumbers

[App page](https://appshunter.io/ios/app/prenumbers/id1142502437)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All exercises | $44.99 | one-time |


### DysViewer

[App page](https://appshunter.io/ios/app/dysviewer/id6745876091)

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

**In-app purchases:** none


## Frequently asked questions

### Is PreNumbers free?

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

### Is DysViewer free?

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

### Do PreNumbers or DysViewer have ads?

Neither PreNumbers nor DysViewer shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*