# Norwegian 4x4 Protocol vs VO2 Max Training

The clearest difference is review sentiment: VO2 Max Training at 100% against Norwegian 4x4 Protocol's 24%. VO2 Max Training also leads on price (Free vs $5.99) and update cadence (every 4 days vs every 3 weeks). Norwegian 4x4 Protocol's advantage is in-app purchases (none vs 6) and chart position (#45 vs unranked). On ads, device support and iOS requirement there is nothing between them.

VO2 Max Training is free to download; Norwegian 4x4 Protocol costs $5.99 up front. VO2 Max Training sells 6 in-app purchases, starting at $0.99 per month. Norwegian 4x4 Protocol asks for nothing beyond the download.

VO2 Max Training holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: Norwegian 4x4 Protocol has 55 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 24% of Norwegian 4x4 Protocol's written reviews are positive against 100% of VO2 Max Training's.

Norwegian 4x4 Protocol ships an update every 3 weeks, VO2 Max Training every 4 days. Both last shipped on November 4, 2026.

## The numbers

| Metric | Norwegian 4x4 Protocol | VO2 Max Training |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | [4.3 (55 ratings)](https://appshunter.io/ios/app/norwegian-4x4-protocol/id6499464775/reviews) | **[4.6 (7 ratings)](https://appshunter.io/ios/app/vo2-max-training-peakvo2/id6532617265/reviews)** |
| Number of ratings | **55** | 7 |
| Positive reviews | 23.5% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#45** | — |
| Size | 5 MB | 16 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Nikita Yampolski](https://appshunter.io/developer/1441915166) | [Cristian Serb](https://appshunter.io/developer/294833680) |

## What reviewers say

### Norwegian 4x4 Protocol

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

**Currently charting:** #45 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


### VO2 Max Training

[App page](https://appshunter.io/ios/app/vo2-max-training-peakvo2/id6532617265)

This app provides science-backed interval training protocols to improve cardiovascular fitness and long-term health. It guides users through warm-ups, work intervals, and cool-downs with customizable timers and activity tracking.

**Highlights:** Science-backed interval protocols (Norwegian 4x4, Tabata, HIIT), Color-coded workout timer with phase transitions, Activity tracking with streaks and progress, Supports running, cycling, rowing, and indoor cardio, Fitness age estimation

**Features:** Apple Watch app

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited | $0.99 | per month |
| Unlimited | $3.99 | per month |
| Unlimited | $4.99 | per 3 months |
| Unlimited | $8.99 | per year |
| Unlimited | $11.99 | per 6 months |
| Lifetime | $17.99 | one-time |


## Frequently asked questions

### Is Norwegian 4x4 Protocol free?

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

### Is VO2 Max Training free?

VO2 Max Training is free to download, with in-app purchases available.

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

VO2 Max Training is rated higher. Norwegian 4x4 Protocol averages 4.3 out of 5 from 55 ratings, while VO2 Max Training averages 4.6 from 7 ratings.

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

Neither Norwegian 4x4 Protocol nor VO2 Max Training shows ads.

### Which is updated more often, Norwegian 4x4 Protocol or VO2 Max Training?

Norwegian 4x4 Protocol ships an update every 3 weeks, and VO2 Max Training every 4 days. Most recently, Norwegian 4x4 Protocol was updated on November 4, 2026 and VO2 Max Training on November 4, 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.*