CO vs JR Smart
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CO
This app syncs data from a smartwatch, including steps, heart rate, and sleep. It also pushes phone notifications to the watch and allows for watch configuration like alarms and weather updates. Health data is for reference only and not for medical use.
- Sync steps, calories, heart rate, sleep, and exercise
- Display data intuitively with a new UI
- Push phone calls and text messages to the watch
- Configure watch alarms, schedules, and backlighting
- Sync weather and AGPS files for watch location
- Access iPhone Health for real-time data sync
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CO FIT is a newly designed and developed app for our new smartwatch collection only. main feature: Sync your steps, calories, mileage, heart rate, sleep and exercise records from your watch. The newly designed UI can display data more intuitively. After binding and authorization, we will push the phone's incoming calls and text messages to the watch to avoid losing information. You can use the app to configure the watch's sedentary alarms, alarms, schedules, backlighting, as well as sync weather and AGPS files (to help the watch locate) and other features for better use of the watch. During use, if you have any questions, you can ask at any time, we will listen to your suggestions and make improvements. Disclaimer: 1. The data displayed by the app is provided by the device, and the app only records and shares 2. All health data displayed in the app are not suitable for medical use, all health data are for reference only, these data should not be used as a substitute for the opinions of health care professionals For accurate data, consult your doctor. Authorization Instructions 1. We will access iPhone Health, sync device data to iPhone Health in real time 2. We will access the mobile phone location to obtain local weather information and synchronize it to the device display
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.
- HealthKit integration
- Real-time heart rate monitoring
- Sleep tracking
- Exercise recording
- Bracelet reminders
- Device search
- Factory reset
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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
Verdict
The clearest difference is ads: JR Smart at none against CO's shown. JR Smart also leads on review sentiment (50% vs 27%) and monetization model (free vs ad-supported). CO's advantage is update cadence (fortnightly vs every 18 months) and ratings volume (1.2K vs 13). On price, rating, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.5 for CO against 4.5 for JR Smart. That said, the two scores are not equally well evidenced: CO has 1.2K ratings behind it against 13, so its average is the more settled of the two. Written reviews are what separate them: 27% of CO's written reviews are positive against 50% of JR Smart's.
CO ships an update fortnightly, JR Smart every 18 months. The most recent releases landed on October 29, 2026 and October 21, 2026 respectively.
| Parameter | CO | JR Smart |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (1.2K ratings) — better | 4.5 (13 ratings) |
| Positive reviews | 27.2% of reviews | 50.0% of reviews — better |
| Number of ratings | 1.2K — better | 13 |
| Update frequency | Fortnightly — better | Every 18 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 14 | 12.0 — better |
| Further details — not scored | ||
| Size | 687 MB | 133 MB |
| Age rating | 12+ | 4+ |
| Developer | 深圳叩鼎科技有限责任公司 | Shenzhen Joyroom Technology Co., Ltd |
Customer experience
CO
JR Smart
Bugs and requests
CO
Reported bugs
7 issues- Time setting not working
- Watch disconnecting frequently
- Inaccurate step and distance tracking
- Inability to change weight in user profile
- Firmware update bricking the watch
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- Syncing issues with iPhone
- Bluetooth not connecting properly
Requested features
7 requests- More watch face designs
- Customization options for watch faces
- Integration with Apple Health
- Ability to remove unwanted features
- Better language support
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- Improved notification handling
- GPS functionality
JR Smart
Not enough reviews yet to summarise bugs or requests.
In-app purchases
CO
No in-app purchases
JR Smart
No in-app purchases









