Comparison

KS OS vs JR Smart

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

KS OS

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
Read full description

KS OS is sports and health App with new features. - It integrates such functions as health data recording, movement track recording and wearable device control, acting as your exclusive health steward. -It records all data from your wearable device, allowing you to focus more on your exercise! After connecting your wearable device to the KS OS App, you have access to: [Manage Health]: Set alarms, call reminders, message notifications, inactivity reminders, drinking reminders, serving as an assistant in your life; Record your sleep data, including sleep duration, deep sleep, light sleep and rapid eye movements (REM), in order to monitor and improve your sleep quality; Record your weight trends and set your weight goal, encouraging you to achieve the daily exercise goal; [Record Exercise& Activities]: Record your exercise data sports (running, biking, swimming, rowing machine, etc.), including your movement track, pace, etc.; Record your daily walking steps, calories, medium and high-intensity exercise and other activity data, and view the complete records on a daily/weekly/monthly basis; [Change Dial]: A rich selection of watch face themes are available in the brand-new cloud dial market, giving your device a new look every day; [Share Achievements]: If you use KS OS App to monitor your excercises continuously, virtual medals will be awarded when you reaches milestones. You can share your weekly exercise information for interaction with your friends. [Data Share]: Connect to synchronize data to Apple Health (HealthKit), to achieve data movement, data and consumed calories sleep simultaneous recording to Apple Health (HealthKit) KS OS App supports multiple languages, and it will support more wearable devices in the future, bringing you more wonderful experiences! You are welcome to send you feedback to: service@kieslect.com

About

JR Smart

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
Read full description

JR Smart app integrates HealthKit to read and write some data in the Health app.   JR Smart is mainly used to connect the Bluetooth bracelet to assist users. Record and display the user's exercise and health status in real time, including information such as heart rate, sleep and exercise. At the same time, it provides users with basic settings such as bracelet reminders, device search, and factory reset. 【Warm Prompt 】 Running track function will continue to use GPS positioning service, switch to the background can still keep running track record, compared to other operation consumes more electricity, will to a certain extent, affect the battery life. Note: Continued use of GPS running in the background can dramatically decrease 'life.

Screenshots

KS OS4 screens
JR Smart3 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
KS OS versus JR Smart: the parameters behind the verdict, then further details
ParameterKS OSJR Smart
PriceFreeFree
Rating3.3 (50 ratings)4.5 (13 ratings) — better
Positive reviews17.9% of reviews50.0% of reviews — better
Number of ratings50 — better13
Update frequencyEvery 4 weeks — betterEvery 18 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS13.012.0 — better
Further details — not scored
Size198 MB133 MB
Age rating4+4+
Developer上海凯斯领拓技术有限公司Shenzhen Joyroom Technology Co., Ltd

Customer experience

KS OS

All ratings30 ratings
Positive53.3%
Neutral10.0%
Negative36.7%
Written reviews84 reviews
Positive17.9%
Neutral19.0%
Negative63.1%

JR Smart

All ratings9 ratings
Positive77.8%
Neutral11.1%
Negative11.1%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

KS OS

No in-app purchases

None

JR Smart

No in-app purchases

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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