# HeitzFit 4 vs CKM66

The clearest difference is update cadence: CKM66 at every 9 days against HeitzFit 4's every 2 months. 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.

HeitzFit 4 ships an update every 2 months, CKM66 every 9 days. The most recent releases landed on November 7, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | HeitzFit 4 | CKM66 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/heitzfit-4/id1570796326/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 7.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 9 days** |
| Monetization | Free | — |
| Size | 99 MB | 40 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HI DEVELOPPEMENT](https://appshunter.io/developer/600864021) | [Nicolas Cudel](https://appshunter.io/developer/1035461478) |

## What reviewers say

### HeitzFit 4

[App page](https://appshunter.io/ios/app/heitzfit-4/id1570796326)

This sports app provides access to your fitness center's services, including personal space management, online booking, and on-demand sports sessions. Track your training, manage personal data, and view invoices all from your mobile device.

**Highlights:** Personal space management, Online booking, On-demand sports sessions, Training and sports tracking, Invoice consultation and download, Personalized dashboard

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

**In-app purchases:** none


### CKM66

[App page](https://appshunter.io/ios/app/ckm66/id6753923165)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HeitzFit 4 free?

HeitzFit 4 is free to download, with no in-app purchases.

### Is CKM66 free?

CKM66 is free to download, with no in-app purchases.

### Do HeitzFit 4 or CKM66 have ads?

Neither HeitzFit 4 nor CKM66 shows ads.

### Which is updated more often, HeitzFit 4 or CKM66?

HeitzFit 4 ships an update every 2 months, and CKM66 every 9 days. Most recently, HeitzFit 4 was updated on November 7, 2026 and CKM66 on October 24, 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.*