# CO vs EohLink

The clearest difference is ads: EohLink at none against CO's shown. EohLink also leads on iOS requirement (10.0 vs 14). CO's advantage is update cadence (fortnightly vs every 2 months). On price, in-app purchases and device support there is nothing between them.

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

CO ships an update fortnightly, EohLink every 2 months. The most recent releases landed on November 11, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | CO | EohLink |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (1.2K ratings)](https://appshunter.io/ios/app/co-fit/id1514529526/reviews)** | — |
| Number of ratings | **1.2K** | — |
| Positive reviews | 26.9% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Ad-supported | — |
| Size | 702 MB | 18 MB |
| Requires iOS | 14 | **10.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [深圳叩鼎科技有限责任公司](https://appshunter.io/developer/1514529525) | [Li Chen](https://appshunter.io/developer/1717743812) |

## What reviewers say

### 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


### EohLink

[App page](https://appshunter.io/ios/app/eohlink/id6781602079)

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

**In-app purchases:** none


## Frequently asked questions

### Is CO free?

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

### Is EohLink free?

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

### Do CO or EohLink have ads?

CO shows ads; EohLink does not.

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

CO ships an update fortnightly, and EohLink every 2 months. Most recently, CO was updated on November 11, 2026 and EohLink on November 5, 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.*