# Morpheus Training vs HIIT 4x4 Lite

The clearest difference is update cadence: Morpheus Training at every 11 days against HIIT 4x4 Lite's every 25 months. Morpheus Training also leads on ratings volume (894 vs 2). HIIT 4x4 Lite's advantage is monetization model (free vs free with in-app purchases) and review sentiment (67% vs 58%). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for Morpheus Training against 5.0 for HIIT 4x4 Lite. That said, the two scores are not equally well evidenced: Morpheus Training has 894 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 58% of Morpheus Training's written reviews are positive against 67% of HIIT 4x4 Lite's.

Morpheus Training ships an update every 11 days, HIIT 4x4 Lite every 25 months. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Morpheus Training | HIIT 4x4 Lite |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (894 ratings)](https://appshunter.io/ios/app/morpheus-training/id1259741445/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/hiit-4x4-lite/id1558498996/reviews)** |
| Number of ratings | **894** | 2 |
| Positive reviews | 58.4% of reviews | **66.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 25 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 71 MB | 18 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Morpheus Labs INC](https://appshunter.io/developer/1259741444) | [Eastridge Technology](https://appshunter.io/developer/392920417) |

## What reviewers say

### Morpheus Training

[App page](https://appshunter.io/ios/app/morpheus-training/id1259741445)

This app optimizes cardio training and recovery by providing personalized heart rate zones and weekly targets. It uses HRV data to guide intensity and volume, helping users improve fitness and conditioning with zone-based interval training.

**Highlights:** Personalized heart rate zones, CardioSmart features, Zone-based interval training (ZBIT), Weekly heart rate zone targets, Daily recovery score, Integrates with wearables and Apple Health Kit

**In-app purchases:** none


### HIIT 4x4 Lite

[App page](https://appshunter.io/ios/app/hiit-4x4-lite/id1558498996)

This app guides you through High Intensity Interval Training (HIIT) workouts using your heart rate as a guide. It sequences exercise between high and low intensity intervals, displaying your progress on a speedometer-style dial. Warning chimes alert you if your heart rate falls outside the target zone.

**Highlights:** High Intensity Interval Training (HIIT) guidance, Heart rate monitoring based on MHR percentage, Speedometer-style heart rate dial, Warning chimes for out-of-range heart rate, Based on NTNU's 4x4 HIIT program

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Morpheus Training free?

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

### Is HIIT 4x4 Lite free?

HIIT 4x4 Lite is free to download, with no in-app purchases.

### Which has better reviews, Morpheus Training or HIIT 4x4 Lite?

HIIT 4x4 Lite is rated higher. Morpheus Training averages 4.9 out of 5 from 894 ratings, while HIIT 4x4 Lite averages 5.0 from 2 ratings.

### Do Morpheus Training or HIIT 4x4 Lite have ads?

Neither Morpheus Training nor HIIT 4x4 Lite shows ads.

### Which is updated more often, Morpheus Training or HIIT 4x4 Lite?

Morpheus Training ships an update every 11 days, and HIIT 4x4 Lite every 25 months. Most recently, Morpheus Training was updated on October 24, 2026 and HIIT 4x4 Lite 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.*