# PreNumbers vs mathekalk

The clearest difference is in-app purchases: mathekalk at none against PreNumbers's 1. mathekalk also leads on update cadence (every 2 months vs every 8 months) and device support (3 vs 1). PreNumbers's advantage is iOS requirement (12.0 vs 17). On price and ads there is nothing between them.

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

PreNumbers ships an update every 8 months, mathekalk every 2 months. The most recent releases landed on October 24, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | PreNumbers | mathekalk |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 months** |
| Size | 42 MB | 22 MB |
| Requires iOS | **12.0** | 17 |
| Devices | iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [IntegraTools GmbH](https://appshunter.io/developer/618103816) | [Stephan Engelhard](https://appshunter.io/developer/1542199587) |

## 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 |


### mathekalk

[App page](https://appshunter.io/ios/app/mathekalk/id1542199585)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is PreNumbers free?

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

### Is mathekalk free?

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

### Do PreNumbers or mathekalk have ads?

Neither PreNumbers nor mathekalk shows ads.

### Which is updated more often, PreNumbers or mathekalk?

PreNumbers ships an update every 8 months, and mathekalk every 2 months. Most recently, PreNumbers was updated on October 24, 2026 and mathekalk on November 3, 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.*