# REM Sleep Tracker vs Stelio Activ

The clearest difference is in-app purchases: Stelio Activ at none against REM Sleep Tracker's 2. Stelio Activ also leads on iOS requirement (14.0 vs 16.0). REM Sleep Tracker's advantage is update cadence (every 2 weeks vs every 4 months). 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. Stelio Activ asks for nothing beyond the download.

REM Sleep Tracker ships an update every 2 weeks, Stelio Activ every 4 months. The most recent releases landed on October 8, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | REM Sleep Tracker | Stelio Activ |
| --- | --- | --- |
| 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** | Every 4 months |
| Monetization | Freemium | — |
| Size | 25 MB | 346 MB |
| Requires iOS | 16.0 | **14.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nicola Eusebi](https://appshunter.io/developer/737311863) | [Mabta](https://appshunter.io/developer/1802868402) |

## 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 |


### Stelio Activ

[App page](https://appshunter.io/ios/app/stelio-activ/id6742317921)

**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 Stelio Activ free?

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

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

Neither REM Sleep Tracker nor Stelio Activ shows ads.

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

REM Sleep Tracker ships an update every 2 weeks, and Stelio Activ every 4 months. Most recently, REM Sleep Tracker was updated on October 8, 2026 and Stelio Activ on October 7, 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.*