# zZZ - Sleep Tracker — Smart & Health Sleep Tracker

> Smart sleep tracker analyzing Apple Watch data for improved sleep quality. (iPhone/iPad app by 子龙 郭.)

- Source: https://appshunter.io/ios/app/zzz-sleep-tracker/id6476821635 (this page in markdown: same URL + `.md`)
- Developer: [子龙 郭](https://appshunter.io/developer/1499776496)
- Category: Health & Fitness, Utilities
- Price: Free
- Age rating: 12+
- Requires: iOS 17.0 · 41 MB
- Languages: English, Chinese, Chinese
- Released: 2024-02-07
- Data updated: 2026-06-05
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/zzz-sleep-tracker/id6476821635/reviews.md

## What is zZZ?

zZZ - Sleep Tracker

Sleep better with zZZ, your smart sleep assistant. We can analyze your sleep data automatically using your Apple Watch.
We using sleep data with the Apple Health app on iPhone empowers you to better manage your sleep. Explore trends about your sleep and compare your sleep quality with many Apple Health metrics that affect sleep.
Join us that have discovered the life-changing benefits of great sleep!

Track your sleep
- Wearing your Apple Watch during sleep. We will automatically detect and analyze your sleep.

Analysis your sleep
- Detailed sleep stage diagram (Awake, REM, Core Sleep, Deep Sleep) and sleep rate.
- Show the percentage & duration of that

More Sleep Info
- Asleep & Awake time
- Explore your sleep history with Day, Week, Month, and Custom Date
- Sleeping wrist temperature, Sleeping heartbeat rate, Respiratory rate
- Discover all aspects of your sleep

Sleep Quality
- Analyze your sleep and rate that.Find the bad days or nice dream days
- Help you to improve your sleep

Setting
- Theme Setting
- Widget
- Notification
- More App Icons
- Share with friends

Watch App
- You can also use the app in your watch.

Privacy by Design
- We uses Apple’s HealthKit API which reads and writes data directly on your device only, and all of your data is stored locally, or on other devices which you enabled iCloud syncing.


FINALLY, Wish you have a good night~

## Key features

- Automatic sleep detection with Apple Watch
- Detailed sleep stage analysis (Awake, REM, Core, Deep)
- Sleep history tracking (Day, Week, Month, Custom)
- Monitoring of heart rate and respiratory rate during sleep
- Sleep quality rating and improvement suggestions
- Watch app support
- Privacy-focused data storage

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/zzz-sleep-tracker/id6476821635/reviews.md

### 5/5 — Really Good

*2024-08-04*

This app is a really nice looking sleep tracking app. The developer has put a lot into this. It’s ui is good and even has widgets and all for nothing. I would pay for this. I find it quite accurate as well. So well done to the dev. No ads and all for free.

## Frequently asked questions about zZZ

### How does zZZ track my sleep?

zZZ automatically detects and analyzes your sleep when you wear your Apple Watch during the night. It then syncs with the Apple Health app on your iPhone to provide comprehensive sleep data.

### What kind of sleep data does zZZ provide?

zZZ offers detailed sleep stage diagrams (Awake, REM, Core Sleep, Deep Sleep), sleep rate, duration, and percentage for each stage. It also tracks your Asleep & Awake times, sleeping wrist temperature, heartbeat rate, and respiratory rate.

### Can I view my sleep history with zZZ?

Yes, you can explore your sleep history with options to view data by Day, Week, Month, and Custom Date ranges. This allows you to identify trends and patterns over time.

### Does zZZ have ads?

No, zZZ is ad-free, providing an uninterrupted experience for tracking and analyzing your sleep.

### What devices does zZZ support?

zZZ is compatible with Apple Watch, iPhone, and iPad, allowing you to monitor your sleep across your Apple ecosystem.

### How does zZZ handle my privacy?

zZZ uses Apple's HealthKit API, which reads and writes data directly on your device. All your sleep data is stored locally or on devices where you have iCloud syncing enabled, ensuring strong privacy by design.

### When was zZZ last updated?

The latest version of zZZ, 1.1.4, was last updated on March 6, 2024. The app was initially released on February 7, 2024.

### What is the age rating for zZZ?

zZZ has an age rating of 12+, making it suitable for teenagers and adults interested in health and fitness tracking.

## Version history (last 5 releases)

### 1.1.4 — 2024-03-06

- Stability improvements.

### 1.1.3 — 2024-02-29

- Stability improvements.
- Support simplified and traditional Chinese.

### 1.1.2 — 2024-02-15

- Support sleeping wrist temperature.
- Add a New Widget.
- Add more sleep info, Now you can also see the Sleep Time & Sleep Duration from the date range you choose.
- Stability improvements.

### 1.1.1 — 2024-02-15

- Add a New Widget.
- Add more sleep info, Now you can also see the Sleep Time & Sleep Duration from the date range you choose.
- Stability improvements.

### 1.1.0 — 2024-02-14

- Add more sleep info, Now you can also see the Sleep Time & Sleep Duration from the date range you choose.
- Stability improvements.

## Apps similar to zZZ

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [SleepMaster:AI Sleep Tracker](https://appshunter.io/ios/app/sleepmasterai-sleep-tracker/id6476530741) | 5.0 (121) | Free | Health & Fitness |
| [Colorange - HRV Stress Monitor](https://appshunter.io/ios/app/colorange-hrv-stress-monitor/id6479391689) | — | Free | Health & Fitness |
| [AutoStress: Stress Monitor](https://appshunter.io/ios/app/autostress-stress-monitor/id6480043170) | 3.0 (2) | Free | Health & Fitness |
| [MindSleep - Top Sleep Tracker](https://appshunter.io/ios/app/mindsleep-top-sleep-tracker/id6480254633) | 4.3 (6) | Free | Health & Fitness |
| [zZz - Sleep Tracker Widget](https://appshunter.io/ios/app/zzz-sleep-tracker-widget/id1586436109) | 3.1 (10) | Free | Health & Fitness |
| [Sleep Tracker And White Noise](https://appshunter.io/ios/app/sleep-tracker-and-white-noise/id1640837983) | 4.4 (36) | Free | Health & Fitness |

## More apps by 子龙 郭

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All apps by 子龙 郭: https://appshunter.io/developer/1499776496

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*