Comparison

iAlignCalc vs iAlignShaft

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

iAlignShaft

Read full description

iShaftAlign is a simple and user-friendly application that has been designed to help you in aligning equipment shafts. The process of ensuring that two shafts are colinear is a very important step in maintenance. iShaftAlign makes this process easy with the help of simple with a dial gauge. This simple app can be used with machines rotating at a maximum speed of 3000rpm. The application guides the user about the corrections that need to be made at each step to ensure the final alignment is within tolerance.

Screenshots

iAlignCalc4 screens
iAlignShaft4 screens

Verdict

The call

The clearest difference is price: iAlignCalc at Free against iAlignShaft's $2.99. iAlignCalc also leads on update cadence (every 4 months vs every 11 months) and device support (3 vs 1). On ads and in-app purchases 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

iAlignCalc is free to download; iAlignShaft costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

iAlignCalc ships an update every 4 months, iAlignShaft every 11 months. The most recent releases landed on November 1, 2026 and October 16, 2026 respectively.

Scorecard4 real differences · 6 level
iAlignCalc versus iAlignShaft: the parameters behind the verdict, then further details
ParameteriAlignCalciAlignShaft
PriceFree — better$2.99
Rating5.0 (2 ratings) — better—
Positive reviews83.3% of reviews—
Number of ratings2 — better—
Update frequencyEvery 4 months — betterEvery 11 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS7.0 — better16.2
Further details — not scored
Size5 MB2 MB
Age rating+44+
DeveloperMotionics LLCHans Babylone

In-app purchases

None

iAlignCalc

No in-app purchases

None

iAlignShaft

No in-app purchases

Questions

Is iAlignCalc free?
iAlignCalc is free to download, with no in-app purchases.
Is iAlignShaft free?
iAlignShaft costs $2.99, with no in-app purchases.
Do iAlignCalc or iAlignShaft have ads?
Neither iAlignCalc nor iAlignShaft shows ads.
Which is updated more often, iAlignCalc or iAlignShaft?
iAlignCalc ships an update every 4 months, and iAlignShaft every 11 months. Most recently, iAlignCalc was updated on November 1, 2026 and iAlignShaft on October 16, 2026.

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