# mechanical design engine vs Piping Engineering Toolbox

The clearest difference is in-app purchases: mechanical design engine at none against Piping Engineering Toolbox's 4. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Piping Engineering Toolbox sells 4 in-app purchases, starting at $1.99 per 7 days. mechanical design engine asks for nothing beyond the download.

mechanical design engine ships an update every 2 months, Piping Engineering Toolbox every 3 months. The most recent releases landed on October 11, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | mechanical design engine | Piping Engineering Toolbox |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.7 (9 ratings)](https://appshunter.io/ios/app/piping-engineering-toolbox/id6654914337/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | — | Free with in-app purchases |
| Size | 63 MB | 61 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [gan dae choi](https://appshunter.io/developer/1574341439) | [Shital Gorasiya](https://appshunter.io/developer/1737199158) |

## What reviewers say

### mechanical design engine

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Piping Engineering Toolbox

[App page](https://appshunter.io/ios/app/piping-engineering-toolbox/id6654914337)

This app provides piping engineers with essential tools, dimensions, and standards for design and analysis. It includes calculators, checklists, software shortcuts, and educational resources to streamline work and enhance knowledge.

**Highlights:** Pipe wall thickness calculator, Branch reinforcement calculator, Piping checklists, Fitting dimensions, Software shortcuts (AutoCAD, MicroStation), Piping standards references (ASME, ASTM), Industry blog and quizzes

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $1.99 | per 7 days |
| Monthly Premium | $3.99 | per month |
| Yearly Premium | $7.99 | per year |
| Lifetime Premium | $12.99 | one-time |


## Frequently asked questions

### Is mechanical design engine free?

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

### Is Piping Engineering Toolbox free?

Piping Engineering Toolbox is free to download, with in-app purchases available.

### Do mechanical design engine or Piping Engineering Toolbox have ads?

Neither mechanical design engine nor Piping Engineering Toolbox shows ads.

### Which is updated more often, mechanical design engine or Piping Engineering Toolbox?

mechanical design engine ships an update every 2 months, and Piping Engineering Toolbox every 3 months. Most recently, mechanical design engine was updated on October 11, 2026 and Piping Engineering Toolbox on September 24, 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.*