# Kstyle OS vs CK OS

The clearest difference is rating: CK OS at 5.0 against Kstyle OS's 3.6. CK OS also leads on iOS requirement (13.0 vs 15.6). Kstyle OS's advantage is update cadence (every 3 days vs fortnightly) and ratings volume (13 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

CK OS holds the better App Store score, 5.0 against 3.6. That said, the two scores are not equally well evidenced: Kstyle OS has 13 ratings behind it against 1, so its average is the more settled of the two.

Kstyle OS ships an update every 3 days, CK OS fortnightly. The most recent releases landed on October 25, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Kstyle OS | CK OS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (13 ratings)](https://appshunter.io/ios/app/kstyle-os/id6503945039/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ck-os/id6667112670/reviews)** |
| Number of ratings | **13** | 1 |
| Positive reviews | 28.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Fortnightly |
| Monetization | Free | Free |
| Size | 248 MB | 255 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [上海凯斯领拓技术有限公司](https://appshunter.io/developer/1696907877) | [Shenzhen Aienmi Technology Co., Ltd.](https://appshunter.io/developer/1761782444) |

## What reviewers say

### Kstyle OS

[App page](https://appshunter.io/ios/app/kstyle-os/id6503945039)

This companion app syncs with a specific smartwatch to display incoming calls and messages. It records and visualizes heart rate and motion data, and allows for smartwatch reminders and alarms. It's designed for general fitness tracking, not medical use.

**Highlights:** Incoming call and SMS/MMS push to smartwatch, Quick reply to rejected calls, Heart rate data recording and visualization, Motion data tracking (steps, distance), Smartwatch reminder and alarm settings, General fitness and health monitoring

**Features:** Vision Pro support

**In-app purchases:** none


### CK OS

[App page](https://appshunter.io/ios/app/ck-os/id6667112670)

Track your workouts with personalized plans and real-time data analysis. Monitor your health with heart rate and sleep tracking, and sync with other health platforms. Achieve your fitness goals with this comprehensive exercise companion.

**Highlights:** Multiple exercise modes, Real-time data tracking, Personalized training plans, Health monitoring, Data synchronization with Apple Health

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Kstyle OS free?

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

### Is CK OS free?

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

### Which has better reviews, Kstyle OS or CK OS?

CK OS is rated higher. Kstyle OS averages 3.6 out of 5 from 13 ratings, while CK OS averages 5.0 from 1 ratings.

### Do Kstyle OS or CK OS have ads?

Neither Kstyle OS nor CK OS shows ads.

### Which is updated more often, Kstyle OS or CK OS?

Kstyle OS ships an update every 3 days, and CK OS fortnightly. Most recently, Kstyle OS was updated on October 25, 2026 and CK OS on October 11, 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.*