PHMS vs CO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PHMS
This app connects to various medical testing devices via Bluetooth to collect and store your health data. View personal health metrics and trend charts, with the option to sync data to cloud servers or Apple HealthKit. Consult a doctor before making medical decisions based on the app's information.
- Bluetooth data collection
- Local data saving
- Cloud server upload option
- Personal health data viewing
- Health trend charts
- Apple HealthKit integration
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PHMS App is used with CONTEC's various medical-grade testing devices. It collects data from the device via Bluetooth. The data can be saved locally and not displayed online. If necessary, the data can be uploaded to the Kangtai Cloud Health server. PHMS App has the functions of viewing personal health data and health trend charts. PHMS supports the following health devices: * Pulse oximeter * Electronic blood pressure monitor * Urine analyzer * Spirometer * Portable electrocardiometer * Ear thermometer PHMS can be linked to Apple HealthKit, and each measurement result can be synchronized to Apple HealthKit (iPad series products do not support this operation). Open Apple HealthKit --> Data Source tab --> Kangtai Cloud Health to set the data items you need PHMS to synchronize. [Disclaimer] Users should consult a doctor before making any medical decisions using the App. Health consultation answers are only for users' reference as health consultation suggestions, but are not used as a basis for diagnosis, confirmation and treatment, nor as any legally binding written proof documents. If users use this as a basis for diagnosis and treatment, any negative impact or even loss caused by it shall be the responsibility of the user, and the platform shall not be responsible. [Jurisdiction Statement] We control and operate this App in China. The hardware devices connected to the App are only licensed for use in China. We do not make any statement about the applicability of any material on this App in any other place. If you choose to access this App from other places, you are responsible for complying with local applicable laws.
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
Screenshots
Verdict
The clearest difference is rating: CO at 4.5 against PHMS's 1.6. CO also leads on ratings volume (1.2K vs 9) and update cadence (fortnightly vs every 2 months). PHMS's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, in-app purchases, device support and iOS requirement 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.
CO holds the better App Store score, 4.5 against 1.6. That said, the two scores are not equally well evidenced: CO has 1.2K ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 10% of PHMS's written reviews are positive against 27% of CO's.
PHMS ships an update every 2 months, CO fortnightly. The most recent releases landed on August 20, 2026 and September 24, 2026 respectively.
| Parameter | PHMS | CO |
|---|---|---|
| Price | Free | Free |
| Rating | 1.6 (9 ratings) | 4.5 (1.2K ratings) — better |
| Positive reviews | 10.0% of reviews | 27.2% of reviews — better |
| Number of ratings | 9 | 1.2K — better |
| Update frequency | Every 2 months | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 14.0 | 14 |
| Further details — not scored | ||
| Size | 63 MB | 687 MB |
| Age rating | 4+ | 12+ |
| Developer | Contec Medical Systems Co., Ltd. | 深圳叩鼎科技有限责任公司 |
Customer experience
PHMS
CO
Bugs and requests
PHMS
Not enough reviews yet to summarise bugs or 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
Show 2 moreShow fewer
- Improved notification handling
- GPS functionality
In-app purchases
PHMS
No in-app purchases
CO
No in-app purchases









