# VO2 Flow: Norwegian 4x4 Timer

> HIIT Intervals for VO2max

Canonical page: [https://chrome-stats.com/d/id6757104585](https://chrome-stats.com/d/id6757104585)

## Overview

- **ID:** `id6757104585`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** CHRISTOPHER DISCOTTO
- **Category:** Health & Fitness
- **Version:** 2.6.1
- **Last updated:** 2026-06-14
- **First published:** 2026-02-13
- **Size:** 25 MB
- **Data as of:** 2026-09-08
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/vo2-flow-norwegian-4x4-timer/id6757104585)
- **Website:** [https://www.discottolabs.com/vo2max-timer](https://www.discottolabs.com/vo2max-timer)
- **Privacy policy:** [https://www.discottolabs.com/privacy/vo2max-timer/](https://www.discottolabs.com/privacy/vo2max-timer/)

## Description

VO2 Flow is built for the Norwegian 4x4 protocol, the research-backed interval method athletes use to raise VO2max. Four 4-minute intervals at 90 to 95% max heart rate, with 3-minute recoveries. Studies show a 10% VO2max increase in 8 weeks.

Run Norwegian 4x4 or build your own protocol. Tabata. 10x1. 8x2. Any work and rest combination, any number of rounds.

Free in the app:
- Norwegian 4x4 protocol built-in and ready to start
- Workout history, every completed session logged and grouped by month
- One custom interval profile
- Apple Music integration, album art and controls during your session
- Audio cues and haptic feedback on every phase transition
- Keep screen awake during workouts
- Landscape and portrait support

Pro upgrade, $4.99 one-time:
- Remove all ads forever
- Unlimited custom interval profiles
- Achievement badges, 7 milestones you can share
- Every future Pro feature, no subscription

This is a timer, not a fitness platform. No social feed. No subscription. No complexity. Launch, pick a profile, start.

## Rankings

- #1,008,229 — Overall

## Similar extensions and apps

- [Tabata & HIIT Timer - PEAKVO2](https://chrome-stats.com/d/id6532617265) — 5.00 / 5
- [Norwegian 4x4 Protocol](https://chrome-stats.com/d/id6499464775) — 4.30 / 5
- [Ramp4x4: VO2 Max Trainer](https://chrome-stats.com/d/id6768789400)
- [Norwegian 4x4 HIIT - Myworkout](https://chrome-stats.com/d/id6497329690) — 4.70 / 5
- [VO2Pro: HIIT Trainer](https://chrome-stats.com/d/id6780353919) — 5.00 / 5
- [Norwegian 4x4 Protocol: Boreas](https://chrome-stats.com/d/id6751464534) — 4.70 / 5
- [N4x4](https://chrome-stats.com/d/id6686407796) — 4.40 / 5
- [VO2Max Hiit Workout](https://chrome-stats.com/d/id6475713309) — 2.00 / 5
- [4x4 HIIT](https://chrome-stats.com/d/id6755360081)
- [Norwegian 4x4 workout](https://chrome-stats.com/d/id6762572409)
- [Peak Intervals](https://chrome-stats.com/d/id6757667069)
- [IntervalFlow: HIIT Timer](https://chrome-stats.com/d/id6788945849)

---

Source: [Chrome-Stats](https://chrome-stats.com/d/id6757104585)