# Rechentrainer vs Why?!

The clearest difference is in-app purchases: Rechentrainer at none against Why?!'s 10. Rechentrainer also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Why?! sells 10 in-app purchases, starting at $7.99 per month. Rechentrainer asks for nothing beyond the download.

Rechentrainer ships an update every 2 months, Why?! monthly. The most recent releases landed on June 4, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Rechentrainer | Why?! |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | — |
| Size | 7 MB | 36 MB |
| Requires iOS | **14.2** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nicolai Kummer](https://appshunter.io/developer/1497635656) | [Looking4Cache UG (haftungsbeschraenkt)](https://appshunter.io/developer/532870489) |

## What reviewers say

### Rechentrainer

[App page](https://appshunter.io/ios/app/rechentrainer/id1497635657)

This app offers personalized math practice for all ages, covering addition, subtraction, multiplication, and division. It features customizable difficulty levels, motivational rewards, and progress tracking to make learning enjoyable and effective.

**Highlights:** Personalized arithmetic practice, Customizable difficulty levels, Motivational reward system, Learning progress tracking, Suitable for all ages

**Features:** macOS Compatibility

**In-app purchases:** none


### Why?!

[App page](https://appshunter.io/ios/app/why/id6749770685)

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Kid / Month | $7.99 | per month |
| 2 Kids / Month | $11.99 | per month |
| 3 Kids / Month | $14.99 | per month |
| 4 Kids / Month | $17.99 | per month |
| 5 Kids / Month | $19.99 | per month |
| 1 Kid / Year | $59.99 | per year |
| 2 Kids / Year | $89.99 | per year |
| 3 Kids / Year | $109.99 | per year |
| 4 Kids / Year | $129.99 | per year |
| 5 Kids / Year | $149.99 | per year |


## Frequently asked questions

### Is Rechentrainer free?

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

### Is Why?! free?

Why?! is free to download, with in-app purchases available.

### Do Rechentrainer or Why?! have ads?

Why?! shows ads; Rechentrainer does not.

### Which is updated more often, Rechentrainer or Why?!?

Rechentrainer ships an update every 2 months, and Why?! monthly. Most recently, Rechentrainer was updated on June 4, 2026 and Why?! on September 19, 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.*