# KaFit vs SZOS

The clearest difference is ads: KaFit at none against SZOS's shown. KaFit also leads on iOS requirement (11.0 vs 13.0). On price, update cadence, 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.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 4, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | KaFit | SZOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.8 (105 ratings)](https://appshunter.io/ios/app/szos/id1543848875/reviews)** |
| Number of ratings | — | **105** |
| Positive reviews | — | 5.3% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | — | Ad-supported |
| Size | 55 MB | 70 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen WO TAI ZHI LIAN TECHNOLOGY CO.,Ltd](https://appshunter.io/developer/1768231207) | [晟 谷](https://appshunter.io/developer/1543671031) |

## What reviewers say

### KaFit

[App page](https://appshunter.io/ios/app/kafit/id1492557617)

**Features:** macOS Compatibility

**In-app purchases:** none


### SZOS

[App page](https://appshunter.io/ios/app/szos/id1543848875)

This app syncs with a smart watch to track your daily activity, including steps, heart rate, and sleep patterns. It provides insights into your health and fitness metrics.

**Highlights:** Step tracking, Heart rate monitoring, Sleep analysis, Syncs with smart watch, Activity mode

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

**In-app purchases:** none


## Frequently asked questions

### Is KaFit free?

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

### Is SZOS free?

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

### Do KaFit or SZOS have ads?

SZOS shows ads; KaFit does not.

### Which is updated more often, KaFit or SZOS?

KaFit ships an update every 3 weeks, and SZOS every 3 weeks. Most recently, KaFit was updated on October 4, 2026 and SZOS on October 18, 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.*