# HIIT 4x4 vs Phy Robotic

The clearest difference is price: Phy Robotic at Free against HIIT 4x4's $9.99. Phy Robotic also leads on rating (5.0 vs 1.0) and update cadence (every 2 months vs every 5 months). HIIT 4x4's advantage is iOS requirement (15.0 vs 18.0). On ratings volume, ads, in-app purchases and device support there is nothing between them.

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

Phy Robotic holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

HIIT 4x4 ships an update every 5 months, Phy Robotic every 2 months. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | HIIT 4x4 | Phy Robotic |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/hiit-4x4/id1450845415/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/phy-robotic/id6557079071/reviews)** |
| Number of ratings | 1 | **2** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 2 MB | 54 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [Eastridge Technology](https://appshunter.io/developer/392920417) | [Phyxd, Inc.](https://appshunter.io/developer/1586114205) |

## 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


### Phy Robotic

[App page](https://appshunter.io/ios/app/phy-robotic/id6557079071)

This app offers advanced body scanning and movement analysis for wellness professionals. It helps measure posture, identify musculoskeletal imbalances, and visualize results in 3D or augmented reality. Seamlessly integrate data with the Phy platform for comprehensive reporting and personalized movement plans.

**Highlights:** Advanced body scanning, Posture and movement assessments, 3D model visualization, AR mode with 3D replay, Seamless integration with Phy platform

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

**In-app purchases:** none


## Frequently asked questions

### Is HIIT 4x4 free?

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

### Is Phy Robotic free?

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

### Which has better reviews, HIIT 4x4 or Phy Robotic?

Phy Robotic is rated higher. HIIT 4x4 averages 1.0 out of 5 from 1 ratings, while Phy Robotic averages 5.0 from 2 ratings.

### Do HIIT 4x4 or Phy Robotic have ads?

Neither HIIT 4x4 nor Phy Robotic shows ads.

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

HIIT 4x4 ships an update every 5 months, and Phy Robotic every 2 months. Most recently, HIIT 4x4 was updated on October 24, 2026 and Phy Robotic on October 16, 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.*