# N4x4 — user reviews

> 6 indexed App Store user reviews of N4x4 by Jan van Rensburg, rated 4.40/5 from 14 ratings.

- Source: https://appshunter.io/ios/app/n4x4/id6686407796/reviews
- App overview in markdown: https://appshunter.io/ios/app/n4x4/id6686407796.md
- Rating breakdown: 5★ 10 · 4★ 0 · 3★ 3 · 2★ 1 · 1★ 0

## Most critical reviews (6 lowest-rated)

### 2/5 — No live Heart Rate

*2026-05-27*

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

**Developer response:** Full Apple Watch (and more heart rate monitors) integration plus live HR display and real time voice coaching in the latest version. Enjoy :-)

### 3/5 — VO2 max history chart missing

*2026-08-05*

App works well for HIIT on my elliptical using a Garmin HRM chest strap, but the VO2 max history chart does not appear anywhere. Sharing with Apple Health is turned on, so I don’t know what the problem is.

**Developer response:** The latest version of the app contains some troubleshooting steps. Please let me know if that doesn't solve your problem!

### 3/5 — Needs HR in display

*2026-05-21*

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.

**Developer response:** Full Apple Watch integration in latest version. Enjoy :-)

### 5/5 — Great and Free

*2026-07-14*

Exactly what I was looking for. Great UI, simple and focused on running for better health and better VO2max. 
Suggestions:
1. Please add a feedback option in the app as a way to send feedback or bugs.
2. Would be highly appreciated if you could add support for health wearables that broadcast their HR (Like Whoop).
Thank you

**Developer response:** Thank you for the great feedback and review. I'm glad you alerted me that Whoop and other HR monitors could send real time heart rate. I mistakenly thought it was only Apple Watch. Whoop and Garmin integration is now in the new version.

### 5/5 — Excellent update

*2026-07-13*

I have been using this app for 6 weeks. The original version was basic and effective. For a free app, I couldn’t be happier. The update adds everything I was missing and compensating for by running multiple apps at the same time during the workout. Thank you!

**Developer response:** Thank you so much for the time you took to leave a review. I'm glad you find it useful.

### 5/5 — 10/10

*2024-10-11*

The app does exactly what it should and it does so with style.

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*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 2026-09-03.*