# Oxygen Advantage® vs Norwegian 4x4 Protocol

The clearest difference is in-app purchases: Oxygen Advantage® at none against Norwegian 4x4 Protocol's 2. Oxygen Advantage® also leads on iOS requirement (11.0 vs 16.6). Norwegian 4x4 Protocol's advantage is rating (4.6 vs 4.2) and update cadence (every 2 weeks vs every 2 months). On price, review sentiment, ratings volume and ads there is nothing between them.

Both are free to download. Norwegian 4x4 Protocol sells 2 in-app purchases, starting at $8.99 per 7 days. Oxygen Advantage® asks for nothing beyond the download.

Norwegian 4x4 Protocol holds the better App Store score, 4.6 against 4.2. Both are backed by a comparable volume of ratings — 110 and 66 respectively. Written reviews split almost evenly too, at 75% and 75% positive.

Oxygen Advantage® ships an update every 2 months, Norwegian 4x4 Protocol every 2 weeks. The most recent releases landed on November 3, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Oxygen Advantage® | Norwegian 4x4 Protocol |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (110 ratings)](https://appshunter.io/ios/app/oxygen-advantage/id1589260950/reviews) | **[4.6 (66 ratings)](https://appshunter.io/ios/app/norwegian-4x4-protocol-boreas/id6751464534/reviews)** |
| Number of ratings | **110** | 66 |
| Positive reviews | 74.6% of reviews | **75.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Freemium |
| Size | 75 MB | 10 MB |
| Requires iOS | **11.0** | 16.6 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 17+ | 4+ |
| Developer | [Oxygen Research Institute Ltd.](https://appshunter.io/developer/1589260952) | [Havard Tryman](https://appshunter.io/developer/1662964293) |

## What reviewers say

### Oxygen Advantage®

[App page](https://appshunter.io/ios/app/oxygen-advantage/id1589260950)

This app offers a personalized daily breathing plan with guided exercises, meditations, and mindfulness coaching to improve physical and mental well-being. It focuses on functional nasal breathing to enhance performance, reduce anxiety, and promote better sleep. Suitable for all ages and fitness levels, it helps build healthy breathing habits.

**Highlights:** Customizable daily breathing plan, Guided meditations and breathwork, Instructional videos library, Breathing pacer with adjustable speed, Progress tracking with charts and graphs, Reminders and custom notifications, Buteyko Breathing Method for kids

**Features:** macOS Compatibility

**In-app purchases:** none


### Norwegian 4x4 Protocol

[App page](https://appshunter.io/ios/app/norwegian-4x4-protocol-boreas/id6751464534)

This app guides you through the Norwegian 4x4 interval training protocol to improve your VO2 max and cardiovascular fitness. It offers customizable warm-up and cooldown durations, voice guidance for intervals, and integrates with Apple Watch for heart rate and calorie tracking.

**Highlights:** Norwegian 4x4 workouts, Voice guidance for intervals, Apple Watch heart rate tracking, Calorie tracking, Save workouts to Health app, No sign-in required

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $8.99 | per 7 days |
| Pro | $24.99 | per year |


## Frequently asked questions

### Is Oxygen Advantage® free?

Oxygen Advantage® is free to download, with no in-app purchases.

### Is Norwegian 4x4 Protocol free?

Norwegian 4x4 Protocol is free to download, with in-app purchases available.

### Which has better reviews, Oxygen Advantage® or Norwegian 4x4 Protocol?

Norwegian 4x4 Protocol is rated higher. Oxygen Advantage® averages 4.2 out of 5 from 110 ratings, while Norwegian 4x4 Protocol averages 4.6 from 66 ratings.

### Do Oxygen Advantage® or Norwegian 4x4 Protocol have ads?

Neither Oxygen Advantage® nor Norwegian 4x4 Protocol shows ads.

### Which is updated more often, Oxygen Advantage® or Norwegian 4x4 Protocol?

Oxygen Advantage® ships an update every 2 months, and Norwegian 4x4 Protocol every 2 weeks. Most recently, Oxygen Advantage® was updated on November 3, 2026 and Norwegian 4x4 Protocol on November 9, 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.*