# REO Mechanical Engineering vs Mechanical Engineering Book

The clearest difference is price: REO Mechanical Engineering at Free against Mechanical Engineering Book's $1.99. Mechanical Engineering Book's advantage is iOS requirement (10.0 vs 14.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

REO Mechanical Engineering is free to download; Mechanical Engineering Book costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

REO Mechanical Engineering ships an update every 21 months, Mechanical Engineering Book every 11 months. The most recent releases landed on September 17, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | REO Mechanical Engineering | Mechanical Engineering Book |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | — | **[4.7 (12 ratings)](https://appshunter.io/ios/app/mechanical-engineering-book/id6448752936/reviews)** |
| Number of ratings | — | **12** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 11 months** |
| Monetization | — | Paid |
| Size | 452 MB | 38 MB |
| Requires iOS | 14.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Rex Banggawan](https://appshunter.io/developer/1516403954) | [Haroon Khalil](https://appshunter.io/developer/1685448939) |

## What reviewers say

### REO Mechanical Engineering

[App page](https://appshunter.io/ios/app/reo-mechanical-engineering/id1616497471)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### Mechanical Engineering Book

[App page](https://appshunter.io/ios/app/mechanical-engineering-book/id6448752936)

This app provides a comprehensive guide to mechanical engineering, covering fundamental concepts, key terms, and essential formulas. It's designed for students and professionals to deepen their understanding of machine mechanisms and engineering principles.

**Highlights:** Learn mechanical engineering principles, Understand machine mechanisms, Access engineering formulas and equations, Explore engineering facts, Covers thermodynamics, materials science, and more, Designed for professionals and students

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

**In-app purchases:** none


## Frequently asked questions

### Is REO Mechanical Engineering free?

REO Mechanical Engineering is free to download, with no in-app purchases.

### Is Mechanical Engineering Book free?

Mechanical Engineering Book costs $1.99, with no in-app purchases.

### Do REO Mechanical Engineering or Mechanical Engineering Book have ads?

Neither REO Mechanical Engineering nor Mechanical Engineering Book shows ads.

### Which is updated more often, REO Mechanical Engineering or Mechanical Engineering Book?

REO Mechanical Engineering ships an update every 21 months, and Mechanical Engineering Book every 11 months. Most recently, REO Mechanical Engineering was updated on September 17, 2026 and Mechanical Engineering Book on September 9, 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.*