WeldEquations vs mechanical design engine
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
WeldEquations
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Useful for the preliminary sizing of welds, WeldEquations is an engineering calculator app that computes the section properties for typical welding patterns used in steel construction. After selecting a Weld Group, the user enters the dimensions for the depth and width. The section properties for the Weld Group, including the area, section moduli and polar moment of inertia, are instantly calculated. For practicality, both weld group dimensions are limited to a minimum of 0.25" and a maximum of 100". The equations used by the app are available for reference and manual verification.
mechanical design engine
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* To calculate basic thickness of cylindrical/rectangular pressure vessel including heads if input data such as pressure, temperature, inner diameter and material information. * flange data can be easily searched. * Profile steel information such as pipe, H, W, I and U-Beam. * Raw material information, that is chemical composition and mechanical properties, for example, ASTM A240 316L, EN10297-1, SUS316L and so on. * Size and shape information of every thread(iso/unf/pf/pt) and shackles(bow/d-type) * To calculate force and moment of solid mechanics according to support type.
Screenshots
Verdict
The clearest difference is update cadence: mechanical design engine at every 2 months against WeldEquations's every 12 months. mechanical design engine also leads on iOS requirement (13.0 vs 26.0). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
WeldEquations ships an update every 12 months, mechanical design engine every 2 months. The most recent releases landed on July 4, 2026 and September 8, 2026 respectively.
| Parameter | WeldEquations | mechanical design engine |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 12 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 26.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 63 MB |
| Age rating | 4+ | 4+ |
| Developer | Glendale Coding Labs, Inc | gan dae choi |
In-app purchases
WeldEquations
No in-app purchases
mechanical design engine
No in-app purchases
Questions
Is WeldEquations free?
Is mechanical design engine free?
Do WeldEquations or mechanical design engine have ads?
Which is updated more often, WeldEquations or mechanical design engine?
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