iAlignTest vs LionSync
Price, ratings, monetisation and update history for both apps, side by side — 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.
LionSync
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Draw a piping isometric on your iPad — in the mechanical room, on the roof, on site — and turn it into the numbers the job runs on. Built for the trades — not a scaled-down CAD suite, and not a sketch app in a construction skin. It understands pipe, so it does the work a seasoned fitter or estimator does by habit. SMART FROM THE FIRST LINE Choose your system — HVAC (Refrigeration or Boiler), Plumbing, or Electrical — and the app sets your materials, line services, pipe sizes and joint types automatically. Industrial steam gets A106 carbon steel. A refrigeration line at -40°F gets A333 low-temp steel, because ordinary carbon steel goes brittle in cold service. Wall schedule follows size, service and design pressure. FITTINGS DRAW THEMSELVES There is no fitting tool, because there doesn't need to be one. Turn a corner and you get a 90 or a 45. Branch off a main and a tee appears, sized as a reducing tee if the branch is smaller. Long runs get couplings, open ends get caps. All drawn as true ISO symbols, with joint marks that match the material. BUILT FOR REAL MEASUREMENTS Type dimensions the way you write them — 8' 6-3/4", 8-6, 102-1/2", 2.6m — to a sixteenth, in imperial or metric. Retype any pipe's length and it resizes in place: the open end moves and the elbow or tee stays anchored. A COMPLETE DRAWING • 14 valve types in true ISO symbols — gate, globe, ball, plug, butterfly, needle, diaphragm, angle, check, stop-check, relief, solenoid, regulator, c**k • Rotate, flip and mirror valves, equipment and annotation • Wall, floor, ceiling, roof and grade lines, with sleeve symbols placed automatically where pipe passes through • Pipe crossings with over/under breaks, the way an iso is meant to read • Text notes, flow arrows, and a dimension tool you can override with a field-verified measurement • Plain lines and shapes — boxes, circles, triangles and more — for markup that's never counted • A north/east axis indicator that stays put while you pan and zoom FREE The full drawing toolset, every system and line service, automatic fittings, the complete valve library, annotation and dimensioning, exact length entry, and up to 2 saved projects. No time limit. No watermark. PRO — ONE-TIME PURCHASE, NO SUBSCRIPTION Everything that turns a drawing into a deliverable: • TAKEOFF & CUT LENGTHS — pipe footage by size and service, fitting and valve counts, and the cut length of every run: centre-to-centre minus fitting take-outs. The number that goes on the saw. • EQUIPMENT LIBRARY — compressors, condensers, evaporators, receivers, accumulators, boilers, heat exchangers, steam traps, water heaters, pumps, backflow preventers, water and gas meters, panels and disconnects. • ESTIMATOR — labor priced by the actual joining method, because a socket weld isn't a butt weld and neither is a solder joint. Each has its own editable rate. Add material prices and your markup for a grand total. • PDF EXPORT — print, email or file the finished drawing. • DRAWING SHEET & TITLE BLOCK — compose the iso on a bordered ANSI sheet with your company, client, project, scale and drawing number. • UNLIMITED SAVED PROJECTS WHO IT'S FOR Service technicians, pipefitters, fabricators, estimators, foremen, plumbers, electricians, and the small contractors who draw, price and run the job themselves. WORKS WHERE YOU WORK Your drawing saves itself as you work, and a guided tour shows new users every tool. No account. No sign-in. No internet connection required. Nothing is uploaded and nothing is collected — your drawings stay on your iPad. It works in a basement with no signal exactly as well as it works at the desk. LionSync-ISO is a field and estimating tool, not engineering design software. Its material and schedule rules are widely used defaults, not a substitute for your project specification, the engineer of record, or governing codes.
Screenshots
Verdict
The clearest difference is in-app purchases: iAlignTest at none against LionSync's 1. iAlignTest also leads on iOS requirement (15.0 vs 18.6). LionSync's advantage is update cadence (weekly vs every 32 months). On price, ads 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
Both are free to download. LionSync sells 1 one-off in-app purchase. iAlignTest asks for nothing beyond the download.
iAlignTest ships an update every 32 months, LionSync weekly. Both last shipped on November 13, 2026.
| Parameter | iAlignTest | LionSync |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 32 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 8 MB | 6 MB |
| Age rating | +4 | 4+ |
| Developer | Motionics LLC | LionSync |
In-app purchases
iAlignTest
No in-app purchases
LionSync
- LionSync-ISO Pro$24.99





