# VeriVaxx vs N4x4

The clearest difference is update cadence: N4x4 at every 2 days against VeriVaxx's every 5 months. VeriVaxx's advantage is iOS requirement (15.1 vs 17.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

VeriVaxx ships an update every 5 months, N4x4 every 2 days. Both last shipped on November 4, 2026.

## The numbers

| Metric | VeriVaxx | N4x4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (20 ratings)](https://appshunter.io/ios/app/n4x4/id6686407796/reviews)** |
| Number of ratings | — | **20** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 days** |
| Monetization | — | Free |
| Size | 40 MB | 16 MB |
| Requires iOS | **15.1** | 17.5 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [Verivaxx, LLC](https://appshunter.io/developer/1627469396) | [Jan van Rensburg](https://appshunter.io/developer/1688121173) |

## What reviewers say

### VeriVaxx

[App page](https://appshunter.io/ios/app/verivaxx/id6479302013)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### N4x4

[App page](https://appshunter.io/ios/app/n4x4/id6686407796)

This app guides you through high-intensity interval training to improve VO2 max. It uses your heart rate monitor to provide real-time cues for effort and recovery, tracking your progress over time. The app offers voice coaching and reminders to help you build a consistent training habit.

**Highlights:** Real-time heart rate zone guidance, Voice and haptic interval cues, Supports multiple heart rate monitors, Workout progress tracking, Hands-free training mode, Apple Health integration

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases:** none


## Frequently asked questions

### Is VeriVaxx free?

VeriVaxx is free to download, with no in-app purchases.

### Is N4x4 free?

N4x4 is free to download, with no in-app purchases.

### Do VeriVaxx or N4x4 have ads?

Neither VeriVaxx nor N4x4 shows ads.

### Which is updated more often, VeriVaxx or N4x4?

VeriVaxx ships an update every 5 months, and N4x4 every 2 days. Most recently, VeriVaxx was updated on November 4, 2026 and N4x4 on November 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*