# KS OS vs JR Smart

The clearest difference is rating: JR Smart at 4.5 against KS OS's 3.3. JR Smart also leads on review sentiment (50% vs 18%). KS OS's advantage is update cadence (every 4 weeks vs every 18 months) and ratings volume (50 vs 13). 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.

JR Smart holds the better App Store score, 4.5 against 3.3. Both are backed by a comparable volume of ratings — 50 and 13 respectively. Written reviews point the same way: 18% of KS OS's written reviews are positive against 50% of JR Smart's.

KS OS ships an update every 4 weeks, JR Smart every 18 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | KS OS | JR Smart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (50 ratings)](https://appshunter.io/ios/app/ks-os/id6451134361/reviews) | **[4.5 (13 ratings)](https://appshunter.io/ios/app/jr-smart/id6593669912/reviews)** |
| Number of ratings | **50** | 13 |
| Positive reviews | 17.9% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 18 months |
| Monetization | Free | Free |
| Size | 198 MB | 133 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, 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 Joyroom Technology Co., Ltd](https://appshunter.io/developer/1760285885) |

## What reviewers say

### KS OS

[App page](https://appshunter.io/ios/app/ks-os/id6451134361)

This app acts as your personal health steward, integrating health data, movement tracking, and wearable device control. Monitor sleep, record exercise, manage daily reminders, and customize your device's appearance. Share achievements and sync data with Apple Health.

**Highlights:** Health data recording, Movement track recording, Wearable device control, Sleep quality monitoring, Exercise and activity tracking, Customizable watch faces, Achievement sharing

**Features:** macOS Compatibility

**In-app purchases:** none


### JR Smart

[App page](https://appshunter.io/ios/app/jr-smart/id6593669912)

This app connects to a Bluetooth bracelet to track and display your real-time health and fitness data, including heart rate, sleep, and exercise. It also offers device management features like reminders and factory resets.

**Highlights:** HealthKit integration, Real-time heart rate monitoring, Sleep tracking, Exercise recording, Bracelet reminders, Device search, Factory reset

**In-app purchases:** none


## Frequently asked questions

### Is KS OS free?

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

### Is JR Smart free?

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

### Which has better reviews, KS OS or JR Smart?

JR Smart is rated higher. KS OS averages 3.3 out of 5 from 50 ratings, while JR Smart averages 4.5 from 13 ratings.

### Do KS OS or JR Smart have ads?

Neither KS OS nor JR Smart shows ads.

### Which is updated more often, KS OS or JR Smart?

KS OS ships an update every 4 weeks, and JR Smart every 18 months. Most recently, KS OS was updated on November 3, 2026 and JR Smart on October 30, 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.*