# iRotorBalance vs HDSensor

The clearest difference is price: HDSensor at Free against iRotorBalance's $4.99. iRotorBalance's advantage is chart position (#184 vs unranked) and iOS requirement (7.1 vs 13.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

HDSensor is free to download; iRotorBalance costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iRotorBalance ships an update every 5 months, HDSensor every 3 months. The most recent releases landed on September 22, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | iRotorBalance | HDSensor |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/irotorbalance/id430978753/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 months** |
| Monetization | Paid | — |
| Best chart rank | **#184** | — |
| Size | 16 MB | 30 MB |
| Requires iOS | **7.1** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Motionics LLC](https://appshunter.io/developer/424498959) | [磊鑫 黄](https://appshunter.io/developer/1896745460) |

## What reviewers say

### iRotorBalance

[App page](https://appshunter.io/ios/app/irotorbalance/id430978753)

**Currently charting:** #184 Top Paid · Utilities (US App Store)

This technical calculator assists in balancing rotating machinery by determining correction weights and angular positions based on vibration measurements. It offers various balancing techniques and allows users to email detailed reports.

**Highlights:** Single-Plane Balancing (Vector Method), Single-Plane Balancing (4-Runs Method), Two-Plane Balancing (Influence Coefficient Method), Angular Mass Distribution Calculation, Permissible Residual Unbalance Determination, Email results as a report

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

**In-app purchases:** none


### HDSensor

[App page](https://appshunter.io/ios/app/hdsensor/id6770826321)

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

**In-app purchases:** none


## Frequently asked questions

### Is iRotorBalance free?

iRotorBalance costs $4.99, with no in-app purchases.

### Is HDSensor free?

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

### Do iRotorBalance or HDSensor have ads?

Neither iRotorBalance nor HDSensor shows ads.

### Which is updated more often, iRotorBalance or HDSensor?

iRotorBalance ships an update every 5 months, and HDSensor every 3 months. Most recently, iRotorBalance was updated on September 22, 2026 and HDSensor on October 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.*