---
title: "Norwegian 4x4 Protocol: Boreas - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "Get started with Norwegian 4x4 interval training.  Norwegian 4x4 Protocol: Boreas makes it easy to get started with the Norwegian 4x4 protocol. Just select warm-up and cooldown duration, and the app h"
---

# Norwegian 4x4 Protocol: Boreas — United States
> Interval training for VO2 max

![Norwegian 4x4 Protocol App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/3d/e6/db/3de6dba0-0b4d-7498-3fcc-7999c0d57953/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png)

**Developer:** [Havard Tryman](https://apptail.io/developer/havard-tryman-cGec)
**Category:** Sports
**Rating:** 4.6/5 (66 ratings)
**Price:** Free
**Bundle ID:** com.vandele.Boreas
**Store:** Apple App Store
**Country:** United States
**Version:** 1.4.5 (released 2026-10-31)
**Original Release:** 2025-08-26
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6751464534)
**AppTail Page:** [https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/united-states](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/united-states)

## Norwegian 4x4 Protocol Description
Get started with Norwegian 4x4 interval training.

Norwegian 4x4 Protocol: Boreas makes it easy to get started with the Norwegian 4x4 protocol. Just select warm-up and cooldown duration, and the app handles the rest. You can connect an Apple Watch to track your heart rate and calories. The app supports voice guidance to let you know when the interval is about to end and when the next interval starts.

Features:
• Perform Norwegian 4x4 workouts.
• Know when the next interval starts while the app is in the background with voice guidance.
• Get current heart rate, heart rate zone and calories from your Apple Watch.
• Save your workouts to the Health app.
• No sign-in is required.

Norwegian 4x4 Protocol: Boreas is a HIIT interval timer for improving cardio, which is relevant if you're training for 5k, 10k, half marathon, marathon, improving VO2 max or general fitness.

If you have a suggestion for how to improve Norwegian 4x4 Protocol: Boreas, feel free to contact the App Support email.

Always consult with a healthcare provider before starting any new exercise program. Exercise can carry risks, especially for people who have certain medical conditions or who have not been physically active in a long time. It's important to understand that using this app does not replace a doctor's advice or treatment.

Terms of use for Norwegian 4x4 Protocol: Boreas: 

## Norwegian 4x4 Protocol Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/c1/39/e3/c139e34f-42f1-0d16-61ff-a2170db700c0/1@3x.jpg/1284x2778.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/61/00/2a/61002aa5-a7e4-7ef1-67bc-2a2e3226203c/2@3x.jpg/1284x2778.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/d7/d1/9a/d7d19a3e-de8d-bd7a-3f62-bf4173f142d7/3@3x.jpg/1284x2778.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/68/bd/47/68bd4758-1b4a-2193-baae-a166926d8211/4@3x.jpg/1284x2778.png)

## Norwegian 4x4 Protocol Rating Breakdown in United States
- 5 stars: 55 (83%)
- 4 stars: 4 (6%)
- 3 stars: 3 (5%)
- 2 stars: 2 (3%)
- 1 stars: 2 (3%)

## Norwegian 4x4 Protocol Reviews in United States

### ***** "Best App for Norwegian 4x4"
This is by far the best app for doing the Norwegian 4x4 training. The alerts help to let you know how much time is left and it works flawlessly.
-- 7gregory, 2026-07-19

### ***** "Best Norwegian 4x4 app with incredible dev support!"
I downloaded a half dozen 4x4 apps and this one was definitely the best, but it was missing the ability to start the intervals at less than 1 minute (worried I’d give myself a heart attack lol), and he replied almost immediately and implemented the change the next day!  Incredible!
-- moogleslam, 2026-06-18

### ***** "It finally works!"
Just redownloaded the app and it now gets heart rate info and the workout automatically began on my watch. Impressive.
-- ChicagolandJim, 2026-02-25

### *---- "No heart guidance??"
Allegedly tracked heart rate, but it’s not live lags quite a bit and I bought this because I thought it was gonna give me coaching if my heart rate was too higher too low to make sure I hit my heart rate without having a painter. Look at things forward working out. Couldn’t try that feature until I bought it, though which kind of ticked me off.
-- Sean1091, 2026-01-08

[View all Norwegian 4x4 Protocol reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)

## Norwegian 4x4 Protocol In-App Purchases
| Item | Price |
|------|-------|
| Pro | $24.99 |


## Norwegian 4x4 Protocol Discovered Keywords
- marathon training
- vo2 max trainer
- boreas

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## Norwegian 4x4 Protocol Available In
- [United States](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/united-states)
- [United Kingdom](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/united-kingdom)
- [Australia](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/australia)
- [Germany](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/germany)
- [Norway](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/norway)
- [Finland](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/finland)
- [Switzerland](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/switzerland)
- [Sweden](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/sweden)
- [Belgium](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/belgium)
- [Philippines](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/philippines)
- [Canada](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/canada)
- [France](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/france)
- [Netherlands](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/netherlands)
- [Panama](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/panama)
- [Ghana](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/ghana)
- [Hong Kong SAR China](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/hong-kong)
- [Hungary](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/hungary)
- [Ireland](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/ireland)
- [Israel](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/israel)
- [India](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/india)
- [Iceland](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/iceland)
- [Italy](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/italy)
- [Japan](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/japan)
- [United Arab Emirates](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/united-arab-emirates)
- [Lithuania](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/lithuania)
- [North Macedonia](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/north-macedonia)
- [Namibia](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/namibia)
- [New Zealand](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/new-zealand)
- [Peru](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/peru)
- [Pakistan](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/pakistan)
- [Poland](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/poland)
- [Saudi Arabia](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/saudi-arabia)
- [Singapore](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/singapore)
- [Türkiye](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/turkey)
- [Ukraine](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/ukraine)
- [Uzbekistan](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/uzbekistan)
- [South Africa](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/south-africa)
- [South Korea](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/south-korea)
- [Austria](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/austria)
- [Azerbaijan](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/azerbaijan)
- [Barbados](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/barbados)
- [Bulgaria](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/bulgaria)
- [Bahrain](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/bahrain)
- [Belarus](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/belarus)
- [Chile](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/chile)
- [Colombia](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/colombia)
- [Cyprus](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/cyprus)
- [Czechia](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/czechia)
- [Denmark](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/denmark)
- [Dominican Republic](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/dominican-republic)
- [Estonia](https://apptail.io/app/norwegian-4x4-protocol-boreas-SmFw/estonia)

---

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