# REM Sleep Tracker vs SleepCalc

The clearest difference is in-app purchases: SleepCalc at none against REM Sleep Tracker's 2. REM Sleep Tracker's advantage is iOS requirement (16.0 vs 18.1). On price, ads and device support there is nothing between them.

Both are free to download. REM Sleep Tracker sells 2 in-app purchases, starting at $9.99 per year. SleepCalc asks for nothing beyond the download.

## The numbers

| Metric | REM Sleep Tracker | SleepCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (49 ratings)](https://appshunter.io/ios/app/rem-sleep-tracker/id6446677275/reviews)** | — |
| Number of ratings | **49** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Monetization | Freemium | — |
| Size | 25 MB | 2 MB |
| Requires iOS | **16.0** | 18.1 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Nicola Eusebi](https://appshunter.io/developer/737311863) | [Emi Sato](https://appshunter.io/developer/1780442627) |

## What reviewers say

### 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 |


### SleepCalc

[App page](https://appshunter.io/ios/app/sleepcalc/id6739146424)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is REM Sleep Tracker free?

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

### Is SleepCalc free?

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

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

Neither REM Sleep Tracker nor SleepCalc shows ads.

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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.*