# HIIT 4x4 Lite vs Go4 Tracker

The clearest difference is update cadence: Go4 Tracker at every 2 months against HIIT 4x4 Lite's every 25 months. HIIT 4x4 Lite's advantage is iOS requirement (12.0 vs 18.6). 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.

HIIT 4x4 Lite ships an update every 25 months, Go4 Tracker every 2 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | HIIT 4x4 Lite | Go4 Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/hiit-4x4-lite/id1558498996/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 25 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 18 MB | 14 MB |
| Requires iOS | **12.0** | 18.6 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Eastridge Technology](https://appshunter.io/developer/392920417) | [Leung Man Ho Thomas](https://appshunter.io/developer/619609289) |

## What reviewers say

### HIIT 4x4 Lite

[App page](https://appshunter.io/ios/app/hiit-4x4-lite/id1558498996)

This app guides you through High Intensity Interval Training (HIIT) workouts using your heart rate as a guide. It sequences exercise between high and low intensity intervals, displaying your progress on a speedometer-style dial. Warning chimes alert you if your heart rate falls outside the target zone.

**Highlights:** High Intensity Interval Training (HIIT) guidance, Heart rate monitoring based on MHR percentage, Speedometer-style heart rate dial, Warning chimes for out-of-range heart rate, Based on NTNU's 4x4 HIIT program

**Features:** macOS Compatibility

**In-app purchases:** none


### Go4 Tracker

[App page](https://appshunter.io/ios/app/go4-tracker/id1616778635)

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is HIIT 4x4 Lite free?

HIIT 4x4 Lite is free to download, with no in-app purchases.

### Is Go4 Tracker free?

Go4 Tracker is free to download, with no in-app purchases.

### Do HIIT 4x4 Lite or Go4 Tracker have ads?

Neither HIIT 4x4 Lite nor Go4 Tracker shows ads.

### Which is updated more often, HIIT 4x4 Lite or Go4 Tracker?

HIIT 4x4 Lite ships an update every 25 months, and Go4 Tracker every 2 months. Most recently, HIIT 4x4 Lite was updated on November 3, 2026 and Go4 Tracker on November 3, 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.*