# iAlignCalc vs RSR Alignment App

The clearest difference is review sentiment: iAlignCalc at 83% against RSR Alignment App's 0%. iAlignCalc also leads on rating (5.0 vs 3.0) and iOS requirement (7.0 vs 11.0). On price, ratings volume, update cadence 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.

iAlignCalc holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews point the same way: 83% of iAlignCalc's written reviews are positive against 0% of RSR Alignment App's.

iAlignCalc ships an update every 4 months, RSR Alignment App every 3 months. The most recent releases landed on September 22, 2026 and June 11, 2026 respectively.

## The numbers

| Metric | iAlignCalc | RSR Alignment App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/ialigncalc/id441151338/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/rsr-alignment-app/id1503116170/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | **83.3% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 5 MB | 57 MB |
| Requires iOS | **7.0** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Motionics LLC](https://appshunter.io/developer/424498959) | [TMC CO.,LTD](https://appshunter.io/developer/920283832) |

## 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


### RSR Alignment App

[App page](https://appshunter.io/ios/app/rsr-alignment-app/id1503116170)

Measure camber and toe angles using your smartphone. The app displays angles for all four corners, allows zero point adjustment, and stores measurement data for later reference. It also lets you change the measurement interval.

**Highlights:** Measure camber angle, Measure toe angle, Display four-corner angles, Zero point adjustment, Store measurement data, Change measurement interval

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iAlignCalc free?

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

### Is RSR Alignment App free?

RSR Alignment App is free to download, with no in-app purchases.

### Which has better reviews, iAlignCalc or RSR Alignment App?

iAlignCalc is rated higher. iAlignCalc averages 5.0 out of 5 from 2 ratings, while RSR Alignment App averages 3.0 from 2 ratings.

### Do iAlignCalc or RSR Alignment App have ads?

Neither iAlignCalc nor RSR Alignment App shows ads.

### Which is updated more often, iAlignCalc or RSR Alignment App?

iAlignCalc ships an update every 4 months, and RSR Alignment App every 3 months. Most recently, iAlignCalc was updated on September 22, 2026 and RSR Alignment App on June 11, 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.*