# Sleep vs REM Sleep Tracker

The clearest difference is rating: REM Sleep Tracker at 4.2 against Sleep's 2.0. REM Sleep Tracker also leads on ads (none vs shown) and update cadence (every 2 weeks vs monthly). Sleep's advantage is iOS requirement (14.0 vs 16.0). On price, review sentiment, in-app purchases and monetization model there is nothing between them.

Both are free to download. Sleep sells 2 in-app purchases, starting at $7.99 per 7 days 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 2.0. That said, the two scores are not equally well evidenced: REM Sleep Tracker has 49 ratings behind it against 5, so its average is the more settled of the two. Written reviews split almost evenly too, at 0% and 0% positive.

Sleep ships an update monthly, REM Sleep Tracker every 2 weeks. Both last shipped on November 3, 2026.

## The numbers

| Metric | Sleep | REM Sleep Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (5 ratings)](https://appshunter.io/ios/app/sleep-tracker-relax-sounds/id1619773534/reviews) | **[4.2 (49 ratings)](https://appshunter.io/ios/app/rem-sleep-tracker/id6446677275/reviews)** |
| Number of ratings | 5 | **49** |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 303 MB | 25 MB |
| Requires iOS | **14.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [DPM APPS LP](https://appshunter.io/developer/1596368239) | [Nicola Eusebi](https://appshunter.io/developer/737311863) |

## What reviewers say

### Sleep

[App page](https://appshunter.io/ios/app/sleep-tracker-relax-sounds/id1619773534)

This app offers a smart alarm clock designed to wake you during light sleep phases, with various alarm types including math problems. It also provides a library of relaxing sounds and music to help you unwind.

**Highlights:** Smart alarm for light sleep phases, Customizable standard alarms, Variety of relaxation sounds, Relaxation music genres, HealthKit integration for step tracking advice, Math equation or text-based wake-up challenges

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $7.99 | per 7 days |
| Yearly Subscription | $39.99 | per year |


### 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 Sleep free?

Sleep 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, Sleep or REM Sleep Tracker?

REM Sleep Tracker is rated higher. Sleep averages 2.0 out of 5 from 5 ratings, while REM Sleep Tracker averages 4.2 from 49 ratings.

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

Sleep shows ads; REM Sleep Tracker does not.

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

Sleep ships an update monthly, and REM Sleep Tracker every 2 weeks. Most recently, Sleep was updated on November 3, 2026 and REM Sleep Tracker on November 3, 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.*