# iAlignCalc vs Machine Defender

The clearest difference is update cadence: iAlignCalc at every 4 months against Machine Defender's every 8 months. iAlignCalc also leads on iOS requirement (7.0 vs 12.1). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for iAlignCalc against 5.0 for Machine Defender. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

iAlignCalc ships an update every 4 months, Machine Defender every 8 months. The most recent releases landed on September 22, 2026 and June 24, 2026 respectively.

## The numbers

| Metric | iAlignCalc | Machine Defender |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/ialigncalc/id441151338/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/machine-defender/id1496754747/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 8 months |
| Monetization | Free | Free |
| Size | 5 MB | 274 MB |
| Requires iOS | **7.0** | 12.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Motionics LLC](https://appshunter.io/developer/424498959) | [ACOEM Group](https://appshunter.io/developer/1495816959) |

## What reviewers say

### iAlignCalc

[App page](https://appshunter.io/ios/app/ialigncalc/id441151338)

This app calculates machine shaft alignment corrections using multiple methods, including two inverted dial, face-rim, and double radial. It also calculates thermal growth and supports angular, parallel, and combined misalignments. Advanced features include PDF report generation with signatures, sketches, audio, and image attachments.

**Highlights:** Two inverted dial method calculations, Face-rim method calculations, Double radial method calculations, Thermal growth calculations, PDF report generation, Interactive tolerance tables and charts, Save and recall alignment sessions

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

**In-app purchases:** none


### Machine Defender

[App page](https://appshunter.io/ios/app/machine-defender/id1496754747)

This app, used with a wireless vibration sensor, collects and analyzes vibration data from industrial rotating machinery. It automatically detects faults in components like motors and pumps, providing diagnostic reports and maintenance recommendations.

**Highlights:** Wireless vibration data collection, Automatic fault detection with AI, Machine health assessment, Maintenance recommendations, Report storage and sharing, Cloud platform connectivity

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iAlignCalc free?

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

### Is Machine Defender free?

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

### Which has better reviews, iAlignCalc or Machine Defender?

iAlignCalc and Machine Defender are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do iAlignCalc or Machine Defender have ads?

Neither iAlignCalc nor Machine Defender shows ads.

### Which is updated more often, iAlignCalc or Machine Defender?

iAlignCalc ships an update every 4 months, and Machine Defender every 8 months. Most recently, iAlignCalc was updated on September 22, 2026 and Machine Defender on June 24, 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.*