# ZDfit vs RDFit

The clearest difference is ads: ZDfit at none against RDFit's shown. ZDfit also leads on rating (3.1 vs 2.8) and monetization model (free vs ad-supported). On price, ratings volume, update cadence and in-app purchases there is nothing between them.

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

ZDfit holds the better App Store score, 3.1 against 2.8. Both are backed by a comparable volume of ratings — 75 and 197 respectively. Written reviews point the same way: 19% of ZDfit's written reviews are positive against 10% of RDFit's.

ZDfit ships an update monthly, RDFit every 3 weeks. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | ZDfit | RDFit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (75 ratings)](https://appshunter.io/ios/app/zdfit/id1669208807/reviews)** | [2.8 (197 ratings)](https://appshunter.io/ios/app/rdfit-runde-intelligent/id6670539969/reviews) |
| Number of ratings | 75 | **197** |
| Positive reviews | **19.1% of reviews** | 10.1% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | **Free** | Ad-supported |
| Size | 250 MB | 257 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Zhongdong Technology Co., Ltd.](https://appshunter.io/developer/1669208809) | [深圳市润德智能通讯科技有限公司](https://appshunter.io/developer/1761719783) |

## What reviewers say

### ZDfit

[App page](https://appshunter.io/ios/app/zdfit/id1669208807)

This app pairs with a smartwatch to provide real-time fitness tracking, including steps, distance, and calories. It also monitors sleep quality and displays notifications from your smartphone, all while integrating with Apple Health.

**Highlights:** Real-time sports performance monitoring, Step, distance, and calorie tracking, Sleep quality monitoring, Smartphone notifications (SMS, calls), Multi-sport activity tracking, Apple Health integration

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Good for basic watch functions
- 👍 Ability to change watch faces works well
- 👍 Altimeter, compass, and pressure functions are invaluable for flying/hiking
- 👍 Easy app setup
- 👍 Can do it all, plethora of options

**What reviewers complain about**

- 🐛 Will not charge
- 🐛 Lacking features when everything is turned off
- 🐛 Some functions don’t work (editing dial)
- 🐛 Trajectory issues, fails to push
- 🐛 Does not perform as advertised (no voice assistant, weather, calling)

**Reported bugs**

- Will not charge
- Trajectory push fails
- Wallpaper download fails
- Bluetooth linking fails
- Watch not updating without app

**Requested features**

- Add voice assistant
- Add weather data
- Enable calling out and answering phone calls
- Improve dial editing functionality
- Improve trajectory push functionality


### RDFit

[App page](https://appshunter.io/ios/app/rdfit-runde-intelligent/id6670539969)

This app syncs with HealthKit to manage your health data. It's developed by a company specializing in smart wearables and electronic products, offering a comprehensive approach to digital health management.

**Highlights:** HealthKit integration, Read and write health data, Smart wearable device support, Electronic product management, Digital health tracking

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

**In-app purchases:** none

**What reviewers like**

- 👍 Amazing watch
- 👍 Great app
- 👍 Useful features

**What reviewers complain about**

- 🐛 Connectivity issues
- 🐛 Unreliable updates
- 🐛 Inaccurate tracking
- 🔋 Poor battery life

**Reported bugs**

- Watch not connecting to phone
- App not recognizing watch
- Time changing unexpectedly
- Syncing issues after updates

**Requested features**

- Customizable watch faces
- Improved fitness tracking
- Ability to save activity routes


## Frequently asked questions

### Is ZDfit free?

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

### Is RDFit free?

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

### Which has better reviews, ZDfit or RDFit?

ZDfit is rated higher. ZDfit averages 3.1 out of 5 from 75 ratings, while RDFit averages 2.8 from 197 ratings.

### Do ZDfit or RDFit have ads?

RDFit shows ads; ZDfit does not.

### Which is updated more often, ZDfit or RDFit?

ZDfit ships an update monthly, and RDFit every 3 weeks. Most recently, ZDfit was updated on November 3, 2026 and RDFit on November 4, 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.*