# zZZ vs KeepBar+

The clearest difference is in-app purchases: zZZ at none against KeepBar+'s 4. KeepBar+'s advantage is iOS requirement (13.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. KeepBar+ sells 4 in-app purchases, starting at $4.99 per month. zZZ asks for nothing beyond the download.

zZZ ships an update every 2 days, KeepBar+ every 4 days. The most recent releases landed on November 4, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | zZZ | KeepBar+ |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 4 days |
| Monetization | Free | — |
| Size | 41 MB | 46 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 12+ | 9+ |
| Developer | [子龙 郭](https://appshunter.io/developer/1499776496) | [信科 刘](https://appshunter.io/developer/1858588368) |

## What reviewers say

### 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


### KeepBar+

[App page](https://appshunter.io/ios/app/keepbar-plus/id6756172904)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Monthly | $4.99 | per month |
| PRO Quarterly | $11.99 | per 3 months |
| PRO Yearly | $35.99 | per year |
| PRO Lifetime | $1.99 | one-time |


## Frequently asked questions

### Is zZZ free?

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

### Is KeepBar+ free?

KeepBar+ is free to download, with in-app purchases available.

### Do zZZ or KeepBar+ have ads?

Neither zZZ nor KeepBar+ shows ads.

### Which is updated more often, zZZ or KeepBar+?

zZZ ships an update every 2 days, and KeepBar+ every 4 days. Most recently, zZZ was updated on November 4, 2026 and KeepBar+ on October 28, 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.*