# Norwegian 4x4 Protocol vs 12 Minute VO2 Max

The clearest difference is price: 12 Minute VO2 Max at Free against Norwegian 4x4 Protocol's $5.99. 12 Minute VO2 Max also leads on rating (5.0 vs 4.3). Norwegian 4x4 Protocol's advantage is ratings volume (55 vs 4) and chart position (#199 vs unranked). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

12 Minute VO2 Max is free to download; Norwegian 4x4 Protocol costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

12 Minute VO2 Max holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Norwegian 4x4 Protocol has 55 ratings behind it against 4, so its average is the more settled of the two.

## The numbers

| Metric | Norwegian 4x4 Protocol | 12 Minute VO2 Max |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | [4.3 (55 ratings)](https://appshunter.io/ios/app/norwegian-4x4-protocol/id6499464775/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/12-minute-vo2-max/id6745093199/reviews)** |
| Number of ratings | **55** | 4 |
| Positive reviews | 23.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | — |
| Monetization | Paid | **Free** |
| Best chart rank | **#199** | — |
| Size | 5 MB | 1 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nikita Yampolski](https://appshunter.io/developer/1441915166) | [Hummingbird Labs Ltd](https://appshunter.io/developer/1767481239) |

## What reviewers say

### Norwegian 4x4 Protocol

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

**Currently charting:** #199 Top Paid · Health & Fitness (US App Store)

This app provides a precise, distraction-free timer for the scientifically studied Norwegian 4x4 HIIT method. Improve cardiovascular performance and endurance with guided interval training cycles. Track your progress and adapt workouts to your fitness level.

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

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

**In-app purchases:** none


### 12 Minute VO2 Max

[App page](https://appshunter.io/ios/app/12-minute-vo2-max/id6745093199)

Estimate your cardiovascular fitness with a scientifically validated 12-minute run test. Track your progress over time with personalized interpretations and visualizations. Improve your endurance and monitor your heart health without expensive equipment.

**Highlights:** 12-minute run test for VO2 max estimation, Personalized VO2 max interpretation, Fitness progress tracking with visualizations, Detailed run history, Adjustable time ranges for progress viewing, Offline functionality

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Norwegian 4x4 Protocol free?

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

### Is 12 Minute VO2 Max free?

12 Minute VO2 Max is free to download, with no in-app purchases.

### Which has better reviews, Norwegian 4x4 Protocol or 12 Minute VO2 Max?

12 Minute VO2 Max is rated higher. Norwegian 4x4 Protocol averages 4.3 out of 5 from 55 ratings, while 12 Minute VO2 Max averages 5.0 from 4 ratings.

### Do Norwegian 4x4 Protocol or 12 Minute VO2 Max have ads?

Neither Norwegian 4x4 Protocol nor 12 Minute VO2 Max shows ads.

---

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