RDFit vs SZOS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Head to head
About
RDFit
This app synchronizes with HealthKit to read and write health data. It's developed by a company specializing in smart wearables and electronic products.
Highlights
- HealthKit integration
- Read Health data
- Write Health data
- Smart wearable device support
- Electronic product integration
Read full descriptionHide full description
RDFit app integrates HealthKit to read and write some data in the Health app. Runde Intelligent Communication is a high-tech company integrating R&D and production of mobile phones and peripheral products, smart wearable devices, and operating e-commerce; R&D and sales of electronic products, digital products, and smart products; electronic software development, electronic products, communication products, and mobile phones , Communication switching equipment, digital integrated system equipment, special electronic equipment, software product design, technology development and technical consulting and sales; computer software, computer network software development; domestic trade, operating import and export business. users to seek a doctor’s advice in addition to using this app and before making any medical decisions.
About
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.
Highlights
- Step tracking
- Heart rate monitoring
- Sleep analysis
- Syncs with smart watch
- Activity mode
Features
Read full descriptionHide full description
"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
RDFit4 screens
SZOS4 screens
Verdict
The call
RDFit and SZOS both sit at 2.8 stars, but that hides the real split: 45% of RDFit's written reviews are positive against 5% of SZOS's. RDFit also leads on ads (none vs shown) and ratings volume (3.1K vs 105). On price, rating, update cadence 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
CostPrice · In-app purchases · Ads · Monetization
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
ReceptionRating · Positive reviews · Number of ratings
On the App Store both sit at effectively the same score — 2.8 for RDFit against 2.8 for SZOS. That said, the two scores are not equally well evidenced: RDFit has 3.1K ratings behind it against 105, so its average is the more settled of the two. Written reviews are what separate them: 45% of RDFit's written reviews are positive against 5% of SZOS's.
UpkeepUpdate frequency
RDFit ships an update fortnightly, SZOS every 3 weeks. Both last shipped on November 3, 2026.
Scorecard4 real differences · 6 level
| Parameter | RDFit | SZOS |
|---|---|---|
| Price | Free | Free |
| Rating | 2.8 (3.1K ratings) — better | 2.8 (105 ratings) |
| Positive reviews | 45.5% of reviews — better | 5.3% of reviews |
| Number of ratings | 3.1K — better | 105 |
| Update frequency | Fortnightly — better | Every 3 weeks |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 290 MB | 70 MB |
| Age rating | 4+ | 4+ |
| Developer | 深圳市润德智能通讯科技有限公司 | 晟 谷 |
Customer experience
RDFit
All ratings359 ratings
Positive63.0%
Neutral11.1%
Negative25.9%
Written reviews88 reviews
Positive45.5%
Neutral23.9%
Negative30.7%
SZOS
All ratings105 ratings
Positive40.0%
Neutral11.4%
Negative48.6%
Written reviews38 reviews
Positive5.3%
Neutral15.8%
Negative78.9%
User reviews
RDFit
From 3.1K App Store ratingsWhat we love
- 👍 Easy to use interface
- ⌚ Beautiful watch design and appearance
- ❤️ Health monitoring features (blood sugar, blood pressure)
- 🎨 Customizable watch faces available
- 📱 Good app connectivity when working properly
Room to improve
- 🐛 Frequent app crashes and freezing
- 📲 Poor notification system (missing SMS/text messages)
- 🔌 Limited watch face customization (only one downloadable at a time)
- 🔗 Unreliable Bluetooth connection and pairing issues
- 📊 Inaccurate health metrics and sensor readings
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
RDFit
Reported bugs
17 issues- App crashes on startup and during synchronization
- App crashes after recent updates
- Watch locks for no reason and cannot unlock
- GPS feature not connecting despite proper setup
- Automatic Bluetooth connection fails
Show 12 moreShow fewer
- SMS/text notifications not received
- Steps not syncing to Apple Health
- Health metrics not syncing properly
- Watch face downloads disappear after 1-2 days
- App not detecting connected watch
- Wallpaper customization crashes app
- Watch band adjustment tool ineffective
- Biometric sensors detect readings without wearing watch
- App crashes when changing wallpaper
- Language settings stuck in non-English languages
- Watch model not displayed in app after extended use
- No software updates received on watch
Requested features
16 requests- Add more watch face options and styles
- Allow multiple watch faces to be downloaded simultaneously
- Implement SMS/text message notifications
- Add Apple Watch-style watch faces
- Enable custom watch face editing with more customization options
Show 11 moreShow fewer
- Add games to the watch
- Support for app store/Google Play integration
- Improve watch face market with better selection
- Add automatic daylight saving time adjustment
- Support for blood glucose measurement in different units (mmol vs dl)
- Add Memoji and font customization options
- Include more live watch faces
- Add NFC card copying functionality
- Improve QR code setup functionality
- Add custom wallpaper with better clearing options
- Support for language settings (English option)
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
None
RDFit
No in-app purchases
None
SZOS
No in-app purchases
Questions
Is RDFit free?
RDFit is free to download, with no in-app purchases.
Is SZOS free?
SZOS is free to download, with no in-app purchases.
Which has better reviews, RDFit or SZOS?
RDFit is rated higher. RDFit averages 2.8 out of 5 from 3.1K ratings, while SZOS averages 2.8 from 105 ratings.
Do RDFit or SZOS have ads?
SZOS shows ads; RDFit does not.
Which is updated more often, RDFit or SZOS?
RDFit ships an update fortnightly, and SZOS every 3 weeks. Most recently, RDFit was updated on November 3, 2026 and SZOS on November 3, 2026.
