# ethos vs Rechnen mit Köpfchen

The clearest difference is price: ethos at Free against Rechnen mit Köpfchen's $1.99. ethos also leads on device support (3 vs 1). Rechnen mit Köpfchen's advantage is in-app purchases (none vs 30). On update cadence, ads and iOS requirement there is nothing between them.

ethos is free to download; Rechnen mit Köpfchen costs $1.99 up front. ethos sells 30 one-off in-app purchases. Rechnen mit Köpfchen asks for nothing beyond the download.

ethos ships an update every 10 months, Rechnen mit Köpfchen every 6 months. The most recent releases landed on October 18, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | ethos | Rechnen mit Köpfchen |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 6 months** |
| Monetization | — | Paid |
| Size | 31 MB | 44 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | +4 | 4+ |
| Developer | [Schwengeler Verlag AG](https://appshunter.io/developer/1502116712) | [Christian Urff](https://appshunter.io/developer/415894463) |

## What reviewers say

### ethos

[App page](https://appshunter.io/ios/app/ethos/id1502116713)

**Features:** macOS Compatibility

**In-app purchases (30)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ethos 03/2023 | $4.99 | one-time |
| ethos 05/2023 | $4.99 | one-time |
| ethos (99568) | $4.99 | one-time |
| ethos (31357) | $4.99 | one-time |
| ethos (2670) | $4.99 | one-time |
| ethos (88249) | $4.99 | one-time |
| ethos (99052) | $4.99 | one-time |
| ethos 04/2023 | $4.99 | one-time |
| ethos (58966) | $4.99 | one-time |
| ethos (11835) | $4.99 | one-time |
| ethos (19828) | $4.99 | one-time |
| ethos (29259) | $4.99 | one-time |
| ethos (91226) | $4.99 | one-time |
| ethos (11748) | $4.99 | one-time |
| ethos (49541) | $4.99 | one-time |
| ethos (48380) | $4.99 | one-time |
| ethos (20608) | $4.99 | one-time |
| ethos (53919) | $4.99 | one-time |
| ethos (77271) | $4.99 | one-time |
| ethos (19869) | $4.99 | one-time |
| ethos (2610) | $9.99 | one-time |
| ethos (84265) | $9.99 | one-time |
| ethos (9783) | $9.99 | one-time |
| ethos (29467) | $9.99 | one-time |
| ethos (87198) | $9.99 | one-time |
| ethos (97255) | $9.99 | one-time |
| ethos (87199) | $9.99 | one-time |
| ethos (68563) | $9.99 | one-time |
| ethos (81749) | $9.99 | one-time |
| ethos (18820) | $9.99 | one-time |


### Rechnen mit Köpfchen

[App page](https://appshunter.io/ios/app/rechnen-mit-kopfchen/id1547091937)

This app helps children discover mathematical relationships and develop calculation strategies. It focuses on understanding how different problems connect and how to use these connections for efficient calculation, rather than just finding answers. It's designed to foster a deeper understanding of math beyond simple counting.

**Highlights:** Discover mathematical relationships, Develop calculation strategies, Understand problem connections, Explore innovative task formats, Adjustable difficulty levels, Suitable for grades 1-4

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ethos free?

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

### Is Rechnen mit Köpfchen free?

Rechnen mit Köpfchen costs $1.99, with no in-app purchases.

### Do ethos or Rechnen mit Köpfchen have ads?

Neither ethos nor Rechnen mit Köpfchen shows ads.

### Which is updated more often, ethos or Rechnen mit Köpfchen?

ethos ships an update every 10 months, and Rechnen mit Köpfchen every 6 months. Most recently, ethos was updated on October 18, 2026 and Rechnen mit Köpfchen on October 14, 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.*