# onSleep vs ZZZ Tracker

The clearest difference is in-app purchases: ZZZ Tracker at none against onSleep's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. onSleep sells 2 in-app purchases, starting at $3.99 per month. ZZZ Tracker asks for nothing beyond the download.

onSleep ships an update monthly, ZZZ Tracker every 3 weeks. Both last shipped on October 28, 2026.

## The numbers

| Metric | onSleep | ZZZ Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Size | 73 MB | 29 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [appsix](https://appshunter.io/developer/1867625178) | [Luc Pham Van](https://appshunter.io/developer/1544588097) |

## What reviewers say

### onSleep

[App page](https://appshunter.io/ios/app/onsleep-sleep-tracker-and-diary/id6757688486)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| onSleep Pro Monthly Plan | $3.99 | per month |
| onSleep Pro Yearly Plan | $29.99 | per year |


### ZZZ Tracker

[App page](https://appshunter.io/ios/app/zzz-tracker/id6778461481)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is onSleep free?

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

### Is ZZZ Tracker free?

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

### Do onSleep or ZZZ Tracker have ads?

Neither onSleep nor ZZZ Tracker shows ads.

### Which is updated more often, onSleep or ZZZ Tracker?

onSleep ships an update monthly, and ZZZ Tracker every 3 weeks. Most recently, onSleep was updated on October 28, 2026 and ZZZ Tracker 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.*