---
title: "VO2 Flow: Norwegian 4x4 Timer - Reviews, Revenue and Downloads in United States | Apple App Store"
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. Studi"
---

# VO2 Flow: Norwegian 4x4 Timer — United States
> HIIT Intervals for VO2max

![VO2 Flow App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/7d/5e/49/7d5e4977-38fc-5258-3791-bc7ebcf7df6f/AppIcon-0-0-1x_U007emarketing-0-8-0-85-220.png/434x0w.png)

**Developer:** [Discotto Labs](https://apptail.io/developer/discotto-labs-CwmYPb)
**Category:** Health Fitness
**Rating:** 5.0/5 (1 ratings)
**Price:** Free
**Bundle ID:** com.discotto.vo2maxTimer
**Store:** Apple App Store
**Country:** United States
**Version:** 2.6.1 (released 2026-06-14)
**Original Release:** 2026-02-13
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6757104585)
**AppTail Page:** [https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/united-states](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/united-states)

## VO2 Flow 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.

## VO2 Flow Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/52/2c/e6/522ce66a-4877-0b75-2448-a231147b94c6/vo2flow-01-hero.png/1284x2778.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/86/e4/5a/86e45a0f-e6d3-5d14-dfc3-97a08e639025/vo2flow-02-music.png/1284x2778.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/f7/d9/75/f7d9754d-62fa-7966-acb2-0f84e0a8413c/vo2flow-03-phases.png/1284x2778.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/53/57/35/53573555-5129-ebf4-e6d7-b0364f9370f5/vo2flow-04-build.png/1284x2778.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/b6/b4/5a/b6b45a39-99d9-e828-88fd-00c302360339/vo2flow-05-track.png/1284x2778.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/b2/0a/bf/b20abfec-145b-4467-c69e-ede5f5217f4a/vo2flow-06-pro.png/1284x2778.png)

## VO2 Flow Rating Breakdown in United States
- 5 stars: 1 (100%)
- 4 stars: 0 (0%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 0 (0%)


## VO2 Flow In-App Purchases
| Item | Price |
|------|-------|
| Pro Upgrade | $6.99 |




## VO2 Flow Available In
- [United States](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/united-states)
- [Bermuda](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/bermuda)
- [Belarus](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/belarus)
- [Canada](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/canada)
- [Chile](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/chile)
- [Cyprus](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/cyprus)
- [Czechia](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/czechia)
- [Ecuador](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/ecuador)
- [Estonia](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/estonia)
- [Croatia](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/croatia)
- [Azerbaijan](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/azerbaijan)
- [Kuwait](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/kuwait)
- [Lithuania](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/lithuania)
- [Luxembourg](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/luxembourg)
- [Latvia](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/latvia)
- [Malta](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/malta)
- [Netherlands](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/netherlands)
- [Portugal](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/portugal)
- [Qatar](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/qatar)
- [Slovakia](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/slovakia)
- [Italy](https://apptail.io/app/vo2-flow-norwegian-4x4-timer-iKiz/italy)

---

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