CO vs SZOS
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
SZOS
This app syncs with a smart watch to track your daily activity, including steps, heart rate, and sleep patterns. It provides insights into your health and fitness metrics.
- Step tracking
- Heart rate monitoring
- Sleep analysis
- Syncs with smart watch
- Activity mode
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"SZOS APP设计为与SZOS智能手表配合使用， 它可以帮助您测量步数，心率，睡眠等" 【温馨提示】 用户开启运动模式后，手机切换至后台仍会持续定位，长时间使用GPS在后台运行可能显著减少电池寿命,影响续航时间。
Screenshots
Verdict
The clearest difference is rating: CO at 4.5 against SZOS's 2.8. CO also leads on review sentiment (27% vs 5%) and ratings volume (1.2K vs 105). On price, update cadence, ads and in-app purchases 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 2.8. That said, the two scores are not equally well evidenced: CO has 1.2K ratings behind it against 105, so its average is the more settled of the two. Written reviews point the same way: 27% of CO's written reviews are positive against 5% of SZOS's.
CO ships an update fortnightly, SZOS every 3 weeks. The most recent releases landed on November 13, 2026 and November 3, 2026 respectively.
| Parameter | CO | SZOS |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (1.2K ratings) — better | 2.8 (105 ratings) |
| Positive reviews | 26.9% of reviews — better | 5.3% of reviews |
| Number of ratings | 1.2K — better | 105 |
| Update frequency | Fortnightly — better | Every 3 weeks |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | Ad-supported |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 14 | 13.0 — better |
| Further details — not scored | ||
| Size | 702 MB | 70 MB |
| Age rating | 12+ | 4+ |
| Developer | 深圳叩鼎科技有限责任公司 | 晟 谷 |
Customer experience
CO
SZOS
User reviews
CO
From 1.2K App Store ratingsWhat we love
- 👍 Easy to connect
- 🤩 Great watch and app experience
- 🤩 Awesome watch
- 👍 Good for the price
- 👍 Looks good
Room to improve
- 🐛 Bluetooth connection issues
- 🐛 App crashes and freezes
- 🐛 Inaccurate measurements
- 🐛 Notifications not working
- 🐛 Firmware issues after updates
SZOS
From 105 App Store ratingsWhat we love
- 👍 Watch looks good
- 👍 Watch features were great
Room to improve
- 🐛 App not working
- 🐛 App crashes
- 🐛 App freezes
- 🐛 White screen of death
- 🐛 App doesn't open
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
Show 2 moreShow fewer
- 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
SZOS
Reported bugs
112 issues- App needs update and fix
- App has white screen of death
- App hasn't been updated in a year
- App will not open
- App no longer functions or is supported
Show 107 moreShow fewer
- Watch can't work without the app
- App stopped working
- App is not working
- App shows ads pop up
- App doesn't let me login
- App asks to download and only gets adds
- Scammer adds
- Cannot use the watch
- Trojan and virus download risk
- Application does not work
- Something wrong when entering application
- Only a blank page
- Please solve the problem
- It's not working at all
- About a month it's not working
- Is not good at all
- Worst app ever
- No cancel button
- App didn't work
- Fix the bug
- It doesn't work
- Screen is white and shows nothing
- New version of this app isn't working on IOS
- برنامج فاشل لا يعمل تسجيل دخول
- Down loads do not work
- Not determined yet
- Very poorly thought out app
- No long term recording of data
- No blood pressure records
- Needs a lot of work to improve it
- The weather does not work
- When asked to select a city on the app, it only lists counties
- Wondering if this is just a hack system
- Remote camera doesn’t work on the watch
- App allows to take pictures, however one is not able to use the watch as a remote in taking a photo
- Not able to download the music I would like to download onto the watch
- Nice to be able to use the watch as a Bluetooth speaker streaming music from my phone to the watch
- Please background add music on
- Cannot play or control music on this device
- Cannot make and receive phone calls
- Not what I was expecting to get when purchased with the description that was given
- Very limited functionality
- The weather does not work
- Cannot update profile with my own information
- Really a mess to surf this app
- Zero explanation
- No way to really have control on your phone to connect your watch
- WhatsApp, isn’t supported nor display on you watch
- Weather alternative didn’t register your location even add it manually
- Need a 100% better development
- I cant apen this app on my apple phone
- Please help me
- Update for temperature to include Fahrenheit and pounds instead of kg also cm to inches
- Got the watch yesterday after a 10 day wait
- Set it up everything works fine
- Really pleased
- Put the phone on charge this morning left it over an hour it was showing fully charged
- Tried to boot back up, but nothing
- So disappointed the watch looks good the features were great
- None of the buttons are functioning
- It’s showing just one word across the centre of the screen which I think is in Chinese but I’m not sure
- Bad news
- No funciona
- Luego de instalsrlo varias veces la aplicacion se bloquea al principio y no funciona
- No se puede utilizar
- App needs background app refresh option so find phone will work properly and so weather will stay updated, when app is minimzed
- App needs a Celsius/Fahrenheit selector for weather as well as imperial/metric selector for other data
- Also suggest a schedule to set up custom hours for the do not disturb option
- The only problem is the dial market is very hit and miss
- Watch face market never loads
- The two times it did couldn’t download watch faces
- Better without not even worth it
- I got this app to connect the watch
- The design and feel of this watch is great but there are a number of issues with the app
- So I’ll be deleting it as it’s unusable
- There is an issue with the dial store because It’s not launching at all
- There is also an issue with accounts because I’m unable to create and manage my own personal account
- There is also an issue with data security because there is none
- With no way to manage the security of the data stored on the app I will have to uninstall
- I can see someone has tried to raise their fault with the team but nothing seem to have been resolved
- App is crap!!
- I was given a watch that goes with this app, ut the app freezes up on everything
- Can’t load anything from the app
- Worthless!!!!!
- Q R code
- It is saying that the Q R code is invalid
- Dial Market freezes the app!
- I have successfully set up and using my new smart watch which is working well, but when I use the app to customise my dial face the ‘Dial Market’ (spinning wheel of death) section of the app continually searches and ends up freezing the app and the app needs to be reset to work again
- Having to only use the default dials that come inbuilt with the watch and not able to use the Dial Market at all to customise the face which is a shame
- The rating is for the app, not the watch !
- The app is very difficult to use on a IPhone
- Every time I try to open the app it locks up
- When it does work nothing is in Fahrenheit or feet and inches
- Unable to set up the time?
- I have difficulties setting regular time even when the watch is connected to my iPhone???
- Appalling
- Cannot register
- App won’t download face dials
- Watch stuck in transmission mode (I only know this using Google translation of a Chinese message on the screen)
- Totally useless watch and totally useless app now
- No way to troubleshoot or log a complaint
- Avoid!
- App not working
- I have downloaded this app to connect to my watch but I am unable to this as the app is requesting me tk create and account but the button does not work
- Please can you fix this ASAP
- Some functions don’t sync
- I have the AW12 smart watch and can’t get the heart rate data to transfer to the app or the heart rate to track daily which is what it looks like it should do hopefully this will be fixed soon
Requested features
11 requests- Update and fix the app
- App needs background app refresh
- Find phone feature
- Weather stay updated
- Celsius/Fahrenheit selector
Show 6 moreShow fewer
- Imperial/metric selector
- Schedule custom hours for do not disturb
- Background add music on
- Update for temperature
- Include pounds instead of kg
- Include cm to inches
In-app purchases
CO
No in-app purchases
SZOS
No in-app purchases
