RDFit vs SZOS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- HealthKit integration
- Read Health data
- Write Health data
- Smart wearable device support
- Electronic product integration
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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.
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
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
RDFit ships an update fortnightly, SZOS every 3 weeks. The most recent releases landed on October 12, 2026 and October 9, 2026 respectively.
| 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
SZOS
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
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- 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
Not enough reviews yet to summarise bugs or requests.
In-app purchases
RDFit
No in-app purchases
SZOS
No in-app purchases
