# Tabata Workout Timer (TWT) vs Norwegian 4x4 Protocol

The clearest difference is ads: Norwegian 4x4 Protocol at none against Tabata Workout Timer (TWT)'s shown. Norwegian 4x4 Protocol also leads on update cadence (fortnightly vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Tabata Workout Timer (TWT) sells 3 in-app purchases, starting at $0.99 per month and Norwegian 4x4 Protocol sells 2 in-app purchases, starting at $8.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Tabata Workout Timer (TWT) ships an update every 2 months, Norwegian 4x4 Protocol fortnightly. The most recent releases landed on October 23, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Tabata Workout Timer (TWT) | Norwegian 4x4 Protocol |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (66 ratings)](https://appshunter.io/ios/app/norwegian-4x4-protocol-boreas/id6751464534/reviews)** |
| Number of ratings | — | **66** |
| Positive reviews | — | 75.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | — | Freemium |
| Size | 51 MB | 9 MB |
| Requires iOS | **15.6** | 16.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [T&D Innovations GbR](https://appshunter.io/developer/1662356742) | [Havard Tryman](https://appshunter.io/developer/1662964293) |

## What reviewers say

### Tabata Workout Timer (TWT)

[App page](https://appshunter.io/ios/app/tabata-workout-timer-twt/id1663612525)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad-free monthly subscription | $0.99 | per month |
| Ad-free 6 month subscription | $3.99 | per 6 months |
| Ad-free yearly subscription | $8.99 | per year |


### 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

**In-app purchases (2)**

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


## Frequently asked questions

### Is Tabata Workout Timer (TWT) free?

Tabata Workout Timer (TWT) is free to download, with in-app purchases available.

### Is Norwegian 4x4 Protocol free?

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

### Do Tabata Workout Timer (TWT) or Norwegian 4x4 Protocol have ads?

Tabata Workout Timer (TWT) shows ads; Norwegian 4x4 Protocol does not.

### Which is updated more often, Tabata Workout Timer (TWT) or Norwegian 4x4 Protocol?

Tabata Workout Timer (TWT) ships an update every 2 months, and Norwegian 4x4 Protocol fortnightly. Most recently, Tabata Workout Timer (TWT) was updated on October 23, 2026 and Norwegian 4x4 Protocol on October 21, 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.*