# Sleep Diary App vs zZZ

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.

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 October 24, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Sleep Diary App | zZZ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.5 (24 ratings)](https://appshunter.io/ios/app/sleep-diary-app/id964733439/reviews)** | — |
| Number of ratings | **24** | — |
| Positive reviews | 59.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 5 MB | 41 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 12+ |
| Developer | [Alexander Ivanov](https://appshunter.io/developer/734258593) | [子龙 郭](https://appshunter.io/developer/1499776496) |

## What reviewers say

### Sleep Diary App

[App page](https://appshunter.io/ios/app/sleep-diary-app/id964733439)

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.

**Highlights:** Log sleep durations, Analyze sleep health, Connect with Apple Health, Share sleep data, Monitor atmospheric pressure (iPhone 6)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Apple | $0.99 | one-time |
| Salad | $2.99 | one-time |
| Bag of healthy food | $9.99 | one-time |


### zZZ

[App page](https://appshunter.io/ios/app/zzz-sleep-tracker/id6476821635)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sleep Diary App free?

Sleep Diary App is free to download, with in-app purchases available.

### Is zZZ free?

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

### Do Sleep Diary App or zZZ have ads?

Neither Sleep Diary App nor zZZ shows ads.

### Which is updated more often, Sleep Diary App or zZZ?

Sleep Diary App ships an update fortnightly, and zZZ every 2 days. Most recently, Sleep Diary App was updated on October 24, 2026 and zZZ on October 6, 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.*