# Sleep Tracker App vs zZZ

The clearest difference is update cadence: zZZ at every 2 days against Sleep Tracker App's every 3 weeks. Sleep Tracker App's advantage is iOS requirement (10.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Sleep Tracker App ships an update every 3 weeks, zZZ every 2 days. The most recent releases landed on September 26, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Sleep Tracker App | zZZ |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | — | Free |
| Size | 83 MB | 41 MB |
| Requires iOS | **10.0** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 12+ |
| Developer | [Leticia Vila](https://appshunter.io/developer/1609278510) | [子龙 郭](https://appshunter.io/developer/1499776496) |

## What reviewers say

### Sleep Tracker App

[App page](https://appshunter.io/ios/app/sleep-tracker-app/id1613407185)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Tracker App free?

Sleep Tracker App is free to download, with no in-app purchases.

### Is zZZ free?

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

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

Neither Sleep Tracker App nor zZZ shows ads.

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

Sleep Tracker App ships an update every 3 weeks, and zZZ every 2 days. Most recently, Sleep Tracker App was updated on September 26, 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.*