Sleep Diary App vs zZZ
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sleep Diary App
Easily log your sleep durations to analyze your health and become more conscious of your sleep patterns. This app integrates with Apple Health to share your sleep data seamlessly. iPhone 6 users can also track atmospheric pressure changes during sleep.
- Log sleep durations
- Analyze sleep health
- Connect with Apple Health
- Share sleep data
- Monitor atmospheric pressure (iPhone 6)
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Sleep Diary is a convenient way to record duration of sleep to analyze your health. We spend about a third part of our life sleeping. Time came to become more conscious about it with a Sleep Diary. This app will help you easily log your sleep durations to the standard Health app. No gadgets required. In addition, lucky owners of iPhone 6 can monitor how atmospheric pressure changed during their sleep. Connect with Apple Health Connect Sleep Diary to Apple's Health to share your sleep data between them. App will ask you to turn reading and writing of sleep analysis data automatically after the first launch.
zZZ
This app analyzes your sleep patterns using data from your Apple Watch and Apple Health. It provides detailed sleep stage diagrams, trends, and insights to help you understand and improve your sleep quality. Features include tracking sleep history, heart rate, and respiratory rate.
- 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
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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~
Screenshots
Verdict
The clearest difference is review sentiment: zZZ at 100% against Sleep Diary App's 59%. zZZ also leads on in-app purchases (none vs 3) and update cadence (every 2 days vs fortnightly). Sleep Diary App's advantage is iOS requirement (13.0 vs 17.0). On price, ads and device support 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. Sleep Diary App sells 3 one-off in-app purchases. zZZ asks for nothing beyond the download.
Sleep Diary App ships an update fortnightly, zZZ every 2 days. The most recent releases landed on September 19, 2026 and June 5, 2026 respectively.
| Parameter | Sleep Diary App | zZZ |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (23 ratings) — better | — |
| Positive reviews | 59.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 23 — better | — |
| Update frequency | Fortnightly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, Apple Watch |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 5 MB | 41 MB |
| Age rating | 4+ | 12+ |
| Developer | Alexander Ivanov | 子龙 郭 |
Customer experience
Sleep Diary App
zZZ
In-app purchases
Sleep Diary App
- Apple$0.99
- Salad$2.99
- Bag of healthy food$9.99
zZZ
No in-app purchases
