# Norwegian 4×4 Cycling — Heart-Rate ERG Trainer

> Heart-Rate ERG Trainer (iPhone/iPad app by Jerome Soika.)

- Source: https://appshunter.io/ios/app/norwegian-44-cycling/id6806197563 (this page in markdown: same URL + `.md`)
- Developer: [Jerome Soika](https://appshunter.io/developer/1505775534)
- Category: Sports, Health & Fitness
- Price: $3.99
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English, Danish, Dutch, Finnish, French (France), German (Germany), Italian, Japanese, Norwegian Bokmål, Polish and 3 more
- Released: 2026-09-11
- Data updated: 2026-10-08

## What is Norwegian 4×4 Cycling?

Norwegian 4×4 is an indoor cycling app for smart trainers. It runs the Norwegian 4×4 interval protocol — four 4-minute work blocks at 90–95% of maximum heart rate, with 3-minute active recovery in between — and controls your trainer's resistance automatically so your heart rate stays in the zone.

This is not a running app. Watts, cadence, ERG control — built for the bike.

HEART-RATE ERG CONTROL

Most training apps set a fixed wattage and leave you to manage your heart rate. Norwegian 4×4 works the other way: it adjusts target watts every block to land your HR in the 90–95% HRmax band.

• Adjustments happen in small steps — no jarring shifts mid-block
• Cardiac drift across blocks is detected and compensated automatically
• Cadence protection prevents the ERG death spiral if you lose power
• Lock the target manually to ride fixed watts whenever you want

TRACKS YOUR PROGRESS

Power at target HR is the headline metric. Each session, the app asks: how many watts did it take to hold 90–95% HRmax? That number, plotted over weeks, shows whether you're getting fitter.

The app builds a rolling 8-session trend once four sessions are logged. Sessions with poor HR-band adherence are excluded automatically. No streaks, no badges — just the number.

HEALTHKIT INTEGRATION

Sessions save to Apple Health as indoor cycling workouts with full HR sample data. VO₂max, resting heart rate, and body mass are read at session start to calibrate targets. No account required. No cloud. Your data stays on your device.

HARDWARE COMPATIBILITY

Works with any Bluetooth smart trainer. Confirmed working with Jetblack and Wahoo. Heart rate via your trainer's built-in HR bridge or any BLE heart rate sensor.

ONE-TIME PURCHASE. NO SUBSCRIPTION.

## Is Norwegian 4×4 Cycling safe?

Not enough ratings yet to assess Norwegian 4×4 Cycling.

## Is Norwegian 4×4 Cycling legit?

Norwegian 4×4 Cycling has limited verification signals. The AppsHunter Legitimacy Score for Norwegian 4×4 Cycling is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 3 releases)

### 1.0.2 — 2026-09-21

Redesigned device pairing: manage your trainer and heart rate sensor in one place, and switch between remembered devices with a tap.

### 1.0.1 — 2026-09-17

Small accessibility fix: the export button in session history now reads correctly with VoiceOver.

### 1.0 — 2026-09-11

No release notes.

## More apps by Jerome Soika

- [ScaleBuddy](https://appshunter.io/ios/app/scalebuddy/id6621269326)

All apps by Jerome Soika: https://appshunter.io/developer/1505775534

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-08.*