# Pipe Flow Gas Pipe Diameter vs Mechanical Engineering Toolkit

The clearest difference is ads: Pipe Flow Gas Pipe Diameter at none against Mechanical Engineering Toolkit's shown. Pipe Flow Gas Pipe Diameter also leads on monetization model (free vs ad-supported) and iOS requirement (11.0 vs 15.0). Mechanical Engineering Toolkit's advantage is ratings volume (64 vs 4). On price, rating, update cadence and in-app purchases there is nothing between them.

Both are free to download. Pipe Flow Gas Pipe Diameter sells 1 one-off in-app purchase and Mechanical Engineering Toolkit sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.8 for Pipe Flow Gas Pipe Diameter against 4.8 for Mechanical Engineering Toolkit. That said, the two scores are not equally well evidenced: Mechanical Engineering Toolkit has 64 ratings behind it against 4, so its average is the more settled of the two.

Pipe Flow Gas Pipe Diameter ships an update fortnightly, Mechanical Engineering Toolkit every 8 days. The most recent releases landed on September 29, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Pipe Flow Gas Pipe Diameter | Mechanical Engineering Toolkit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (4 ratings)](https://appshunter.io/ios/app/pipe-flow-gas-pipe-diameter/id1582795941/reviews) | [4.8 (64 ratings)](https://appshunter.io/ios/app/mechanical-engineering-toolkit/id1601099443/reviews) |
| Number of ratings | 4 | **64** |
| Positive reviews | — | 57.1% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | **Every 8 days** |
| Monetization | **Free** | Ad-supported |
| Size | 67 MB | 38 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Pipe Flow Software](https://appshunter.io/developer/1193064957) | [APPS BAY LIMITED](https://appshunter.io/developer/1599035519) |

## What reviewers say

### Pipe Flow Gas Pipe Diameter

[App page](https://appshunter.io/ios/app/pipe-flow-gas-pipe-diameter/id1582795941)

This utility app calculates the minimum internal pipe diameter for gas flow based on flow rate and pressure loss. It supports various calculation equations and offers comprehensive results with customizable units and databases for materials, fluids, and fittings.

**Highlights:** Calculates minimum internal pipe diameter, Supports multiple flow equations (AGA, Weymouth, etc.), Handles gas density changes with Ideal Gas Law, Includes databases for gases, pipe materials, and fittings, User-definable custom data, Imperial and Metric unit support, Generates Excel and PDF reports

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pipe Flow Gas Pipe Diameter | $4.99 | one-time |


### Mechanical Engineering Toolkit

[App page](https://appshunter.io/ios/app/mechanical-engineering-toolkit/id1601099443)

This utility app provides a comprehensive collection of engineering equations and formulas for students and professionals. Easily perform calculations by selecting a formula and inputting variables, with detailed instructions and reference material included.

**Highlights:** Engineering equations and formulas, Mechanics of Material calculations, Theory of Elasticity formulas, Composite Material properties, Reference material, Variable input for calculations

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is Pipe Flow Gas Pipe Diameter free?

Pipe Flow Gas Pipe Diameter is free to download, with in-app purchases available.

### Is Mechanical Engineering Toolkit free?

Mechanical Engineering Toolkit is free to download, with in-app purchases available.

### Which has better reviews, Pipe Flow Gas Pipe Diameter or Mechanical Engineering Toolkit?

Pipe Flow Gas Pipe Diameter and Mechanical Engineering Toolkit are both rated 4.8 out of 5 on the App Store, from 4 and 64 ratings respectively.

### Do Pipe Flow Gas Pipe Diameter or Mechanical Engineering Toolkit have ads?

Mechanical Engineering Toolkit shows ads; Pipe Flow Gas Pipe Diameter does not.

### Which is updated more often, Pipe Flow Gas Pipe Diameter or Mechanical Engineering Toolkit?

Pipe Flow Gas Pipe Diameter ships an update fortnightly, and Mechanical Engineering Toolkit every 8 days. Most recently, Pipe Flow Gas Pipe Diameter was updated on September 29, 2026 and Mechanical Engineering Toolkit 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.*