# Norwegian 4x4 Protocol vs Built Different

The clearest difference is price: Built Different at Free against Norwegian 4x4 Protocol's $5.99. Built Different also leads on iOS requirement (15.0 vs 17.6). Norwegian 4x4 Protocol's advantage is in-app purchases (none vs 1) and update cadence (every 3 weeks vs every 2 months). On ads and device support there is nothing between them.

Built Different is free to download; Norwegian 4x4 Protocol costs $5.99 up front. Built Different sells 1 in-app purchase, starting at $250.00 per month. Norwegian 4x4 Protocol asks for nothing beyond the download.

Norwegian 4x4 Protocol ships an update every 3 weeks, Built Different every 2 months. The most recent releases landed on October 18, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Norwegian 4x4 Protocol | Built Different |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[4.3 (54 ratings)](https://appshunter.io/ios/app/norwegian-4x4-protocol/id6499464775/reviews)** | — |
| Number of ratings | **54** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Paid | — |
| Best chart rank | **#79** | — |
| Size | 5 MB | 56 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Nikita Yampolski](https://appshunter.io/developer/1441915166) | [Joshua Feliciano](https://appshunter.io/developer/1791586780) |

## What reviewers say

### Norwegian 4x4 Protocol

[App page](https://appshunter.io/ios/app/norwegian-4x4-protocol/id6499464775)

**Currently charting:** #79 Top Paid · Health & Fitness (US App Store)

This app guides you through the effective Norwegian 4x4 interval training method to boost cardiovascular performance and endurance. It features a precision timer, heart rate zone tracking, and progress monitoring for scientifically proven results.

**Highlights:** Precision 4min work / 3min rest cycles, Heart rate zone tracking (90-95% max HR), VO2 Max improvement tracking, Multiple HIIT workout protocols, Progress monitoring, Universal cardio training support, Offline functionality

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Built Different

[App page](https://appshunter.io/ios/app/built-different/id6740777521)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Coaching | $250.00 | per month |


## Frequently asked questions

### Is Norwegian 4x4 Protocol free?

Norwegian 4x4 Protocol costs $5.99, with no in-app purchases.

### Is Built Different free?

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

### Do Norwegian 4x4 Protocol or Built Different have ads?

Neither Norwegian 4x4 Protocol nor Built Different shows ads.

### Which is updated more often, Norwegian 4x4 Protocol or Built Different?

Norwegian 4x4 Protocol ships an update every 3 weeks, and Built Different every 2 months. Most recently, Norwegian 4x4 Protocol was updated on October 18, 2026 and Built Different on October 19, 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.*