# N4x4 vs Four by Four (fa7b3d)

The clearest difference is device support: Four by Four (fa7b3d) at 4 against N4x4's 2. Four by Four (fa7b3d) also leads on iOS requirement (13.4 vs 17.5). On price, 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.

## The numbers

| Metric | N4x4 | Four by Four (fa7b3d) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (20 ratings)](https://appshunter.io/ios/app/n4x4/id6686407796/reviews)** | — |
| Number of ratings | **20** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 days | — |
| Monetization | Free | — |
| Size | 15 MB | 44 MB |
| Requires iOS | 17.5 | **13.4** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Jan van Rensburg](https://appshunter.io/developer/1688121173) | [Bhavik Patel](https://appshunter.io/developer/1890740800) |

## What reviewers say

### N4x4

[App page](https://appshunter.io/ios/app/n4x4/id6686407796)

This app guides you through the scientifically-backed Norwegian 4x4 HIIT protocol to efficiently boost your VO2 Max and cardiovascular health. It offers set-and-forget workouts with visual and audio cues, suitable for all fitness levels.

**Highlights:** Norwegian 4x4 HIIT protocol, Set-and-forget workout structure, Visual and audio interval cues, Real-time heart rate zone display, 5-minute warm-up, 4 rounds of 4-minute intervals, 3-minute recovery periods

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

**In-app purchases:** none


### Four by Four (fa7b3d)

[App page](https://appshunter.io/ios/app/four-by-four-fa7b3d/id6766068267)

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

**In-app purchases:** none


## Frequently asked questions

### Is N4x4 free?

N4x4 is free to download, with no in-app purchases.

### Is Four by Four (fa7b3d) free?

Four by Four (fa7b3d) is free to download, with no in-app purchases.

### Do N4x4 or Four by Four (fa7b3d) have ads?

Neither N4x4 nor Four by Four (fa7b3d) 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.*