# PHMS vs CO

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.

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.

## The numbers

| Metric | PHMS | CO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.6 (9 ratings)](https://appshunter.io/ios/app/phms/id908936490/reviews) | **[4.5 (1.2K ratings)](https://appshunter.io/ios/app/co-fit/id1514529526/reviews)** |
| Number of ratings | 9 | **1.2K** |
| Positive reviews | 10.0% of reviews | **27.2% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | **Free** | Ad-supported |
| Size | 63 MB | 687 MB |
| Requires iOS | 14.0 | 14 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Contec Medical Systems Co., Ltd.](https://appshunter.io/developer/908936493) | [深圳叩鼎科技有限责任公司](https://appshunter.io/developer/1514529525) |

## What reviewers say

### PHMS

[App page](https://appshunter.io/ios/app/phms/id908936490)

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.

**Highlights:** Bluetooth data collection, Local data saving, Cloud server upload option, Personal health data viewing, Health trend charts, Apple HealthKit integration

**Features:** Vision Pro support

**In-app purchases:** none


### CO

[App page](https://appshunter.io/ios/app/co-fit/id1514529526)

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.

**Highlights:** 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

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

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to connect
- 🤩 Great watch and app experience
- 🤩 Awesome watch
- 👍 Good for the price
- 👍 Looks good

**What reviewers complain about**

- 🐛 Bluetooth connection issues
- 🐛 App crashes and freezes
- 🐛 Inaccurate measurements
- 🐛 Notifications not working
- 🐛 Firmware issues after updates

**Reported bugs**

- Time setting not working
- Watch disconnecting frequently
- Inaccurate step and distance tracking
- Inability to change weight in user profile
- Firmware update bricking the watch

**Requested features**

- More watch face designs
- Customization options for watch faces
- Integration with Apple Health
- Ability to remove unwanted features
- Better language support


## Frequently asked questions

### Is PHMS free?

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

### Is CO free?

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

### Which has better reviews, PHMS or CO?

CO is rated higher. PHMS averages 1.6 out of 5 from 9 ratings, while CO averages 4.5 from 1.2K ratings.

### Do PHMS or CO have ads?

CO shows ads; PHMS does not.

### Which is updated more often, PHMS or CO?

PHMS ships an update every 2 months, and CO fortnightly. Most recently, PHMS was updated on August 20, 2026 and CO on September 24, 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.*