N4x4

Name: N4x4
Rating: 4.2 (6 reviews)
Author: Jan van Rensburg

By: Jan van Rensburg

Gold Standard for VO2 Max

Features & Capabilities

N4x4 - Norwegian 4x4 HIIT Trainer

Ready to transform your fitness? N4x4 brings you the scientifically-backed Norwegian 4x4 HIIT protocol—the most efficient way to boost your VO2 Max and build a bulletproof cardiovascular system.

WHY N4x4?

• It's set and forget: Press start, then just train. No fiddling with timers. • Visual and audio cues guide you through every interval • Perfect for beginners and advanced athletes alike

WHAT YOU GET:

• 5-minute warm-up to prepare your body • 4 rounds of 4-minute high-intensity intervals • 3-minute recovery periods between rounds • Real-time heart rate zone display based on your age

WHY VO2 MAX MATTERS: Your VO2 Max is the single greatest predictor of lifespan. Studies confirm high-intensity interval training like Norwegian 4x4 is the most efficient way to improve it. Top longevity experts (like Dr. Peter Attia) swear by it.

NO STRINGS ATTACHED:

• 100% free • No sign-ups • No ads • No in-app purchases • Just you and your workout

Download N4x4 now and start building a stronger, healthier heart today. Your future self will thank you.

User Growth & Download Statistics

App

By:

Jan van Rensburg

Rating:

4.20

(6)

Version:

3.44 Last updated: 2026-04-03

Version code:

884100736

Creation date:

2024-09-16

Compatible devices:

Size:

8.34MB

URLs:

Website ,Privacy policy

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-07-04

Compare stats and ranking:

Ranking

# 507,117 ▼ 5,588

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.

Developed by:

Jan van Rensburg

Apple Apps Store

https://apps.apple.com/us/app/n4x4/id6686407796

Website:

https://n4x4.app

User Reviews

Overall it looks good and seems to have the functionality I want. I yet need to actually test it.

by se*****, 2026-06-21

Disappointing. Screen should show live heart rate or at least zone during the exercise.

by bg*****, 2026-05-27

All it shows is time and target heart rate in the interval. Takes up whole screen as it should…but didn’t find a way to display my live heart rate. So it’s just a timer if you ask me.