# ZDfit vs K

The clearest difference is rating: K at 3.5 against ZDfit's 3.0. K also leads on review sentiment (39% vs 19%) and ratings volume (319 vs 72). On price, update cadence, ads 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.

K holds the better App Store score, 3.5 against 3.0. Both are backed by a comparable volume of ratings — 72 and 319 respectively. Written reviews point the same way: 19% of ZDfit's written reviews are positive against 39% of K's.

ZDfit ships an update monthly, K every 6 weeks. The most recent releases landed on October 16, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | ZDfit | K |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (72 ratings)](https://appshunter.io/ios/app/zdfit/id1669208807/reviews) | **[3.5 (319 ratings)](https://appshunter.io/ios/app/k-watch/id6443482628/reviews)** |
| Number of ratings | 72 | **319** |
| Positive reviews | 19.1% of reviews | **38.9% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 6 weeks |
| Monetization | Free | Free |
| Size | 250 MB | 232 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Zhongdong Technology Co., Ltd.](https://appshunter.io/developer/1669208809) | [HONGKONG AMAZWEAR TECH CO., LTD.](https://appshunter.io/developer/1812791867) |

## 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


### K

[App page](https://appshunter.io/ios/app/k-watch/id6443482628)

Track your daily activity, including steps, distance, and calories burned. Analyze your sleep patterns with detailed insights into deep sleep, light sleep, and awake times. Set activity goals and receive notifications.

**Highlights:** Accurate activity tracking, GPS route tracking, Daily activity goals, In-depth sleep analysis, Vibrating alarm reminder, Push notifications

**In-app purchases:** none


## Frequently asked questions

### Is ZDfit free?

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

### Is K free?

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

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

K is rated higher. ZDfit averages 3.0 out of 5 from 72 ratings, while K averages 3.5 from 319 ratings.

### Do ZDfit or K have ads?

Neither ZDfit nor K shows ads.

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

ZDfit ships an update monthly, and K every 6 weeks. Most recently, ZDfit was updated on October 16, 2026 and K on October 12, 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.*