iAlignTest vs JS
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
iAlignTest
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An interactive reference tool for machine shaft alignment. It provides the common reference tables, specifications and charts for shaft alignment tolerance. Three main standards are included: 1- NASA Precision Alignment Specs (Ames Policy Directive APD 8830.1) 1.a) Alignment Tolerance for Soft Foot 1.b) Alignment Tolerance for Short Coupling: Horizontal and Angular 1.c) Alignment Tolerance for couplings with spacers 2- Common Tolerance Table with the RPM input for Angular, Parallel, and Spacer Shaft cases User selects the RPM range, enters alignment values and sees the alignment condition and tolerance range for the machine. 3- Interactive Alignment Tolerance Chart with three regions: Excellent, Acceptable, and Unacceptable. User enters RPM, offset and angles in both horizontal and vertical directions, and interactively sees the condition of the machine in the chart Features: - Shaft Alignment Specification: NASA Standard - Interactive Shaft Alignment Tolerance Table - Interactive Shaft Alignment Tolerance Chart in mm and inch - Email the results DISCLAIMER: iAlignTest is intended for educational purposes. Although the references in this App are made with great care, however it may contain errors and inaccuracies. Using the results of this App is the responsibility of the user.
JS
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A modern and intuitive calculator for determining the weight and cost of various metal profiles. Supported profiles: ⢠Sheet / Plate ⢠Angle ⢠Channel ⢠Double Channel (I-Beam) ⢠Tee ⢠Pipe ⢠Round Rod ⢠Square Rod ⢠Hexagonal Rod ⢠Hexagonal Pipe ⢠Closed Profile (Box Section) Key features: ⢠Precise Weight Calculation: Instantly calculate weight based on dimensions. ⢠Material Database: Select from a predefined list of metals. ⢠Cost Estimation: Estimate total price based on unit price input. ⢠History & Export: Save your calculations locally and export them to professional PDF reports. ⢠Modern Design: Light and dark theme support with a beautiful Liquid Glass interface. Who is it for? For professionals, engineers, and technicians who need fast and precise metal weight calculations - whether in the office, on the factory floor, or in the workshop.
Screenshots
Verdict
The clearest difference is update cadence: JS at every 4 weeks against iAlignTest's every 32 months. iAlignTest's advantage is iOS requirement (15.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
iAlignTest ships an update every 32 months, JS every 4 weeks. The most recent releases landed on September 22, 2026 and September 26, 2026 respectively.
| Parameter | iAlignTest | JS |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 32 months | Every 4 weeks ā better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.0 ā better | 26.0 |
| Further details ā not scored | ||
| Size | 8 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Motionics LLC | JS-METALS SP. Z O.O. |
In-app purchases
iAlignTest
No in-app purchases
JS
No in-app purchases









