# HIIT 4x4 vs SolWalks

The clearest difference is price: SolWalks at Free against HIIT 4x4's $9.99. SolWalks also leads on update cadence (every 2 weeks vs every 5 months). HIIT 4x4's advantage is device support (3 vs 1). On ads, in-app purchases and iOS requirement there is nothing between them.

SolWalks is free to download; HIIT 4x4 costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HIIT 4x4 ships an update every 5 months, SolWalks every 2 weeks. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | HIIT 4x4 | SolWalks |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/hiit-4x4/id1450845415/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 2 MB | 4 MB |
| Requires iOS | **15.0** | 16.2 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Eastridge Technology](https://appshunter.io/developer/392920417) | [Evgeniy Basistyi](https://appshunter.io/developer/1485868532) |

## What reviewers say

### HIIT 4x4

[App page](https://appshunter.io/ios/app/hiit-4x4/id1450845415)

This app guides you through High Intensity Interval Training (HIIT) workouts using your heart rate as a percentage of your Maximum Heart Rate (MHR). It features a speedometer-style dial to monitor your heart rate zones and provides chimes to keep you in target.

**Highlights:** Heart rate zone monitoring, Speedometer-style dial, Warning chimes for out-of-zone heart rate, Workout history storage via Apple Health, Customizable MHR calculation, Structured 4x4 HIIT program

**In-app purchases:** none


### SolWalks

[App page](https://appshunter.io/ios/app/solwalks/id6449439493)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HIIT 4x4 free?

HIIT 4x4 costs $9.99, with no in-app purchases.

### Is SolWalks free?

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

### Do HIIT 4x4 or SolWalks have ads?

Neither HIIT 4x4 nor SolWalks shows ads.

### Which is updated more often, HIIT 4x4 or SolWalks?

HIIT 4x4 ships an update every 5 months, and SolWalks every 2 weeks. Most recently, HIIT 4x4 was updated on November 2, 2026 and SolWalks on November 7, 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.*