# REM Sleep Tracker vs HydraIQ

The clearest difference is ads: REM Sleep Tracker at none against HydraIQ's shown. HydraIQ's advantage is update cadence (every 6 days vs every 2 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. REM Sleep Tracker sells 2 in-app purchases, starting at $9.99 per year and HydraIQ sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

REM Sleep Tracker ships an update every 2 weeks, HydraIQ every 6 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | REM Sleep Tracker | HydraIQ |
| --- | --- | --- |
| 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 | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 6 days** |
| Monetization | Freemium | — |
| Size | 25 MB | 10 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | **iPhone, Apple Watch** |
| Age rating | 4+ | 12+ |
| Developer | [Nicola Eusebi](https://appshunter.io/developer/737311863) | [Maddisys Limited](https://appshunter.io/developer/399854564) |

## 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 |


### HydraIQ

[App page](https://appshunter.io/ios/app/hydraiq-smart-hydration/id6761833957)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HydraIQ Pro Monthly | $1.99 | per month |
| HydraIQ Pro Annual | $14.99 | per year |


## Frequently asked questions

### Is REM Sleep Tracker free?

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

### Is HydraIQ free?

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

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

HydraIQ shows ads; REM Sleep Tracker does not.

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

REM Sleep Tracker ships an update every 2 weeks, and HydraIQ every 6 days. Most recently, REM Sleep Tracker was updated on October 24, 2026 and HydraIQ on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*