# zZz vs REM Sleep Tracker

The clearest difference is rating: REM Sleep Tracker at 4.2 against zZz's 2.9. REM Sleep Tracker also leads on ratings volume (49 vs 11). zZz's advantage is update cadence (every 4 days vs every 2 weeks). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. zZz sells 1 one-off in-app purchase and REM Sleep Tracker sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.

REM Sleep Tracker holds the better App Store score, 4.2 against 2.9. Both are backed by a comparable volume of ratings — 11 and 49 respectively. Written reviews split almost evenly too, at 0% and 0% positive.

zZz ships an update every 4 days, REM Sleep Tracker every 2 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | zZz | REM Sleep Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.9 (11 ratings)](https://appshunter.io/ios/app/zzz-sleep-tracker-widget/id1586436109/reviews) | **[4.2 (49 ratings)](https://appshunter.io/ios/app/rem-sleep-tracker/id6446677275/reviews)** |
| Number of ratings | 11 | **49** |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 2 weeks |
| Monetization | Free with in-app purchases | Freemium |
| Size | 6 MB | 25 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Florian Schweizer](https://appshunter.io/developer/1142213239) | [Nicola Eusebi](https://appshunter.io/developer/737311863) |

## What reviewers say

### zZz

[App page](https://appshunter.io/ios/app/zzz-sleep-tracker-widget/id1586436109)

Easily log your sleep with a single tap using home or lock screen widgets. Track time in bed, awake time, and actual sleep duration, syncing data with Apple Health for insightful analysis.

**Highlights:** One-tap sleep logging, Home and lock screen widgets, Tracks time in bed, awake, and sleep, Syncs with Apple Health, Siri and Shortcuts integration

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Tier | $0.99 | one-time |


### REM Sleep Tracker

[App page](https://appshunter.io/ios/app/rem-sleep-tracker/id6446677275)

This app analyzes Apple Watch sensor data to provide a sleep quality score. It offers detailed insights into sleep stages, heart rate, and weekly trends, helping users understand and improve their rest habits.

**Highlights:** Sleep quality scoring, Detailed sleep stage analysis (light, deep, REM), Heart rate monitoring, Weekly trend tracking, Sleep bank concept for habit analysis, Apple Health integration

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sleep Score Premium Yearly | $9.99 | per year |
| Sleep Score Premium Yearly | $29.99 | per year |


## Frequently asked questions

### Is zZz free?

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

### Is REM Sleep Tracker free?

REM Sleep Tracker is free to download, with in-app purchases available.

### Which has better reviews, zZz or REM Sleep Tracker?

REM Sleep Tracker is rated higher. zZz averages 2.9 out of 5 from 11 ratings, while REM Sleep Tracker averages 4.2 from 49 ratings.

### Do zZz or REM Sleep Tracker have ads?

Neither zZz nor REM Sleep Tracker shows ads.

### Which is updated more often, zZz or REM Sleep Tracker?

zZz ships an update every 4 days, and REM Sleep Tracker every 2 weeks. Most recently, zZz was updated on October 24, 2026 and REM Sleep Tracker on October 24, 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.*