# CDSiPipe vs mechanical design engine

The clearest difference is update cadence: mechanical design engine at every 2 months against CDSiPipe's every 4 months. CDSiPipe's advantage is iOS requirement (9.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

CDSiPipe ships an update every 4 months, mechanical design engine every 2 months. The most recent releases landed on September 22, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | CDSiPipe | mechanical design engine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cdsipipe/id665877570/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 315 MB | 63 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Charles D. Sheehy, Inc.](https://appshunter.io/developer/665877574) | [gan dae choi](https://appshunter.io/developer/1574341439) |

## What reviewers say

### CDSiPipe

[App page](https://appshunter.io/ios/app/cdsipipe/id665877570)

This app serves as a comprehensive reference toolbox for process piping, HVAC, and MEP professionals. It provides detailed information on steel pipe and valve specifications, including dimensions, pressure ratings, coatings, and finishes. Users can quickly access data through an intuitive interface with picker wheels and drop-down menus.

**Highlights:** Steel pipe specifications (OD, ID, weight, volume, wall thickness), Valve pressure ratings and dimensions, Information on pipe coatings, finishes, and types, Explanations of valve types (Butterfly, Gate, Check, Globe, Ball), Glossaries of piping industry terms and abbreviations, FAQ sections for pipe and valve categories

**Features:** macOS Compatibility

**In-app purchases:** none


### mechanical design engine

[App page](https://appshunter.io/ios/app/mechanical-design-engine/id1574341437)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CDSiPipe free?

CDSiPipe is free to download, with no in-app purchases.

### Is mechanical design engine free?

mechanical design engine is free to download, with no in-app purchases.

### Do CDSiPipe or mechanical design engine have ads?

Neither CDSiPipe nor mechanical design engine shows ads.

### Which is updated more often, CDSiPipe or mechanical design engine?

CDSiPipe ships an update every 4 months, and mechanical design engine every 2 months. Most recently, CDSiPipe was updated on September 22, 2026 and mechanical design engine on October 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*