Comparison

iAlignTest vs Sealing Materials Selector

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

Head to head
About

iAlignTest

Features
Read full description

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.

About

Sealing Materials Selector

Easily find the right sealing materials by entering specifications like temperature and hardness. Filter by chemical compatibility, approvals, or product type for O-Rings, Quad-Rings, and V-Rings. Request material datasheets directly through the app.

Highlights
  • Search by material specifications
  • Filter by temperature and hardness
  • Chemical compatibility filtering
  • Institute approvals filtering
  • Product type filtering (O-Rings, Quad-Rings, V-Rings)
  • Request material datasheets
Features
Read full description

Sealing Materials Selector app allows you to easily search Trelleborg Sealing Solutions materials. By simply entering Material Specifications, like for example Material Group, in combination with your required parameters, such as temperature or hardness, the app instantly proposes the right materials for your need. In addition, you can filter down your search based upon chemical compatibilities, institute approvals or by product type for O-Rings, Quad-Rings and V-Rings. You even can request Material Datasheets through the app, if available.

Screenshots

iAlignTest4 screens
Sealing Materials Selector4 screens

Verdict

The call

The clearest difference is update cadence: Sealing Materials Selector at every 11 months against iAlignTest's every 32 months. On price, ads, in-app purchases and device support 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.

UpkeepUpdate frequency

iAlignTest ships an update every 32 months, Sealing Materials Selector every 11 months. The most recent releases landed on September 22, 2026 and June 4, 2026 respectively.

Scorecard1 real difference · 8 level
iAlignTest versus Sealing Materials Selector: the parameters behind the verdict, then further details
ParameteriAlignTestSealing Materials Selector
PriceFreeFree
Rating—5.0 (2 ratings) — better
Number of ratings—2 — better
Update frequencyEvery 32 monthsEvery 11 months — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size8 MB15 MB
Age rating4+4+
DeveloperMotionics LLCTrelleborg Sealing Solutions

In-app purchases

None

iAlignTest

No in-app purchases

None

Sealing Materials Selector

No in-app purchases

Questions

Is iAlignTest free?
iAlignTest is free to download, with no in-app purchases.
Is Sealing Materials Selector free?
Sealing Materials Selector is free to download, with no in-app purchases.
Do iAlignTest or Sealing Materials Selector have ads?
Neither iAlignTest nor Sealing Materials Selector shows ads.
Which is updated more often, iAlignTest or Sealing Materials Selector?
iAlignTest ships an update every 32 months, and Sealing Materials Selector every 11 months. Most recently, iAlignTest was updated on September 22, 2026 and Sealing Materials Selector on June 4, 2026.

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