# WHOOP by ECOTEC vs Colditz.app

The clearest difference is update cadence: Colditz.app at every 4 days against WHOOP by ECOTEC's fortnightly. Colditz.app also leads on iOS requirement (15.6 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

WHOOP by ECOTEC ships an update fortnightly, Colditz.app every 4 days. The most recent releases landed on October 24, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | WHOOP by ECOTEC | Colditz.app |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Size | 84 MB | 75 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [KIRCHHOFF Ecotec GmbH](https://appshunter.io/developer/1564236642) | [Mirko Fischer](https://appshunter.io/developer/1548987261) |

## What reviewers say

### WHOOP by ECOTEC

[App page](https://appshunter.io/ios/app/whoop-by-ecotec/id1564236640)

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

**In-app purchases:** none


### Colditz.app

[App page](https://appshunter.io/ios/app/colditzapp/id6761426441)

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

**In-app purchases:** none


## Frequently asked questions

### Is WHOOP by ECOTEC free?

WHOOP by ECOTEC is free to download, with no in-app purchases.

### Is Colditz.app free?

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

### Do WHOOP by ECOTEC or Colditz.app have ads?

Neither WHOOP by ECOTEC nor Colditz.app shows ads.

### Which is updated more often, WHOOP by ECOTEC or Colditz.app?

WHOOP by ECOTEC ships an update fortnightly, and Colditz.app every 4 days. Most recently, WHOOP by ECOTEC was updated on October 24, 2026 and Colditz.app on October 15, 2026.

---

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