Comparison

iAlignCalc vs Machine Defender

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

iAlignCalc

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
Read full description

iAlignCalc is an iPhone/iPad/iPod Touch application to calculate machine shaft alignment corrections. Features: - Calculates machine shaft alignment corrections using the two inverted dial method. - Calculates machine shaft alignment corrections using the face-rim method. - Calculates machine shaft alignment corrections using the double radial method. - Calculates thermal growth for different materials - Can be used for angular, parallel, and combined misalignments New Features in Version 1.2 for iPhone: - Interactive Shaft Alignment Specification: NASA Standard - Interactive Shaft Alignment Tolerance Table - Interactive Shaft Alignment Tolerance Chart - Report Generation Report Features: - PDF report output - Include user signature - Sketch pad to draw - Voice recording and audio attachment - Email PDF report - Save the PDF file on disk to be accessed from computer - Print the PDF to an Airprint - Include the plant location and the map in the PDF - Up to 5 image attachments from camera, library or screenshots of the alignment calculations - Include text and notes - Speech-to-text feature (Available in iPhone 4S only) New Features in Version 1.3 for iPhone: - Users can save the values and calculations for each alignment session and see them in a table based on the date, and name of the machine. Each saved session can be called and viewed later. Disclaimer: iAlignCalc is intended for educational purposes. Although the calculations done by this application were made with great care, it may contain errors or inaccuracies. Using the results of the calculations is the responsibility of the user.

About

Machine Defender

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
Read full description

Used in combination with the wireless vibration sensor CAC100800, the ACOEM Machine Defender app helps mechanics to collect vibration data wirelessly and detect faults automatically with the ACOEM Accurex artificial intelligence engine. It is now possible to assess automatically the health of industrial rotating assets and detect faults on various components such as: electric motors, pumps, fans, compressors, gearboxes and more. The vibration measurement settings are automatically defined based on a visual description of the machine kinematics in the field on the mobile device. The user is guided step by step through the whole vibration measurement process, and the ACOEM Accurex automatic diagnostic is performed instantly right in front of the rotating machine and without prior learning phase needed. It provides automatic diagnostic capabilities with overall machinery health assessment, list of faults detected with severity, location on the machine and confidence level, and first level of maintenance recommendation. The following types of defects are managed: bearing or lubrication problem, unbalance, misalignment, structural resonance, pump cavitation, gear defects, shocks or modulation resulting from electrical defects or looseness, other ISO failures such as belt wear, soft foot, nearby disturbance, and more. Results and reports can easily be stored in the app and communicated through native features of the mobile device. It can also be connected to the ai.acoem.com cloud platform, centralizing vibration diagnostics reports, laser alignment reports, data trending and maintenance tasks management. The ACOEM Machine Defender app empowers mechanics to easily improve industrial plant reliability and performance with modern maintenance solutions. To learn more, please visit our website at acoem.com Wireless sensors compatible: CAC1008000

Screenshots

iAlignCalc4 screens
Machine Defender4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 8 level
iAlignCalc versus Machine Defender: the parameters behind the verdict, then further details
ParameteriAlignCalcMachine Defender
PriceFreeFree
Rating5.0 (2 ratings)5.0 (1 ratings)
Positive reviews83.3% of reviews—
Number of ratings2 — better1
Update frequencyEvery 4 months — betterEvery 8 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS7.0 — better12.1
Further details — not scored
Size5 MB274 MB
Age rating4+4+
DeveloperMotionics LLCACOEM Group

Customer experience

iAlignCalc

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews6 reviews
Positive83.3%
Neutral16.7%
Negative0.0%

Machine Defender

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

iAlignCalc

No in-app purchases

None

Machine Defender

No in-app purchases

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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