# iAlignCalc vs Pre

The clearest difference is iOS requirement: iAlignCalc at 7.0 against Pre's 13.0. On price, rating, ratings volume and update cadence 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 Pre. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

iAlignCalc ships an update every 4 months, Pre every 7 months. The most recent releases landed on September 22, 2026 and June 24, 2026 respectively.

## The numbers

| Metric | iAlignCalc | Pre |
| --- | --- | --- |
| 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/pre-alignment/id1499479273/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 7 months |
| Monetization | Free | Free |
| Size | 5 MB | 67 MB |
| Requires iOS | **7.0** | 13.0 |
| 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


### Pre

[App page](https://appshunter.io/ios/app/pre-alignment/id1499479273)

This app guides users through pre-alignment tasks using a connected Bluetooth probe. It allows measurement and recording of run-out, bearing clearance, and soft foot, with the ability to generate instant PDF reports.

**Highlights:** Bluetooth connectivity, Icon-based adaptive user interface, Measure and record Run-Out, Measure and record Bearing Clearance, Measure and record True SoftCheck, Generate instant PDF reports

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iAlignCalc free?

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

### Is Pre free?

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

### Which has better reviews, iAlignCalc or Pre?

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

### Do iAlignCalc or Pre have ads?

Neither iAlignCalc nor Pre shows ads.

### Which is updated more often, iAlignCalc or Pre?

iAlignCalc ships an update every 4 months, and Pre every 7 months. Most recently, iAlignCalc was updated on September 22, 2026 and Pre 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.*