# PrepFE vs Mechanical Engineering Book

The clearest difference is price: PrepFE at Free against Mechanical Engineering Book's $1.99. PrepFE also leads on update cadence (every 2 months vs every 11 months) and review sentiment (17% vs 0%). Mechanical Engineering Book's advantage is rating (4.7 vs 2.0) and in-app purchases (none vs 9). On ads and device support there is nothing between them.

PrepFE is free to download; Mechanical Engineering Book costs $1.99 up front. PrepFE sells 6 one-off in-app purchases. Mechanical Engineering Book asks for nothing beyond the download.

Mechanical Engineering Book holds the better App Store score, 4.7 against 2.0. Both are backed by a comparable volume of ratings — 57 and 12 respectively. Written reviews complicate that: 17% of PrepFE's written reviews are positive against 0% of Mechanical Engineering Book's, so the app with the better star average is not the one people write more warmly about.

PrepFE ships an update every 2 months, Mechanical Engineering Book every 11 months. The most recent releases landed on October 8, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | PrepFE | Mechanical Engineering Book |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [2.0 (57 ratings)](https://appshunter.io/ios/app/prepfe-fe-mechanical-prep/id1455746709/reviews) | **[4.7 (12 ratings)](https://appshunter.io/ios/app/mechanical-engineering-book/id6448752936/reviews)** |
| Number of ratings | **57** | 12 |
| Positive reviews | **16.7% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 11 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 288 MB | 38 MB |
| Requires iOS | 13.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [PrepFE, Inc.](https://appshunter.io/developer/1499557437) | [Haroon Khalil](https://appshunter.io/developer/1685448939) |

## What reviewers say

### PrepFE

[App page](https://appshunter.io/ios/app/prepfe-fe-mechanical-prep/id1455746709)

Prepare for the FE Mechanical exam with practice problems and flashcards. Learn by doing with expert-curated content, track your progress, and identify areas for improvement. Study conveniently on your mobile device, anytime, anywhere.

**Highlights:** Practice FE exam questions, Interactive practice exams, Hundreds of practice questions, Detailed step-by-step explanations, Reinforce learning with flashcards, Breakdown of strengths and weaknesses

**Features:** Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Access Renewal | $47.99 | one-time |
| 1 Month Access | $59.99 | one-time |
| 3 Months Access Renewal | $61.99 | one-time |
| 6 Months Access Renewal | $75.99 | one-time |
| 3 Months Access | $79.99 | one-time |
| 6 Months Access | $99.99 | one-time |


### 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 PrepFE free?

PrepFE is free to download, with in-app purchases available.

### Is Mechanical Engineering Book free?

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

### Which has better reviews, PrepFE or Mechanical Engineering Book?

Mechanical Engineering Book is rated higher. PrepFE averages 2.0 out of 5 from 57 ratings, while Mechanical Engineering Book averages 4.7 from 12 ratings.

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

Neither PrepFE nor Mechanical Engineering Book shows ads.

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

PrepFE ships an update every 2 months, and Mechanical Engineering Book every 11 months. Most recently, PrepFE was updated on October 8, 2026 and Mechanical Engineering Book on October 1, 2026.

---

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