# Engineering HandBook vs PrepFE

The clearest difference is rating: Engineering HandBook at 4.0 against PrepFE's 2.0. Engineering HandBook also leads on in-app purchases (none vs 9) and update cadence (every 2 weeks vs every 2 months). PrepFE's advantage is ratings volume (57 vs 4). On price, ads and device support there is nothing between them.

Both are free to download. PrepFE sells 6 one-off in-app purchases. Engineering HandBook asks for nothing beyond the download.

Engineering HandBook holds the better App Store score, 4.0 against 2.0. That said, the two scores are not equally well evidenced: PrepFE has 57 ratings behind it against 4, so its average is the more settled of the two.

Engineering HandBook ships an update every 2 weeks, PrepFE every 2 months. The most recent releases landed on June 8, 2026 and August 30, 2026 respectively.

## The numbers

| Metric | Engineering HandBook | PrepFE |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/engineering-handbook/id843746804/reviews)** | [2.0 (57 ratings)](https://appshunter.io/ios/app/prepfe-fe-mechanical-prep/id1455746709/reviews) |
| Number of ratings | 4 | **57** |
| Positive reviews | — | 16.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 12 MB | 288 MB |
| Requires iOS | **6.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Raghu Srinivas](https://appshunter.io/developer/843746807) | [PrepFE, Inc.](https://appshunter.io/developer/1499557437) |

## What reviewers say

### Engineering HandBook

[App page](https://appshunter.io/ios/app/engineering-handbook/id843746804)

Access essential engineering formulas and concepts on the go. This app covers materials, numbers, mechanics, components, and metal cutting operations, providing accurate calculations for various engineering tasks.

**Highlights:** Engineering formulas and calculations, Materials classification and properties, Basic and trigonometric calculations, Unit conversions, Gear drive formulas, Metal cutting operation calculations

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Engineering HandBook free?

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

### Is PrepFE free?

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

### Which has better reviews, Engineering HandBook or PrepFE?

Engineering HandBook is rated higher. Engineering HandBook averages 4.0 out of 5 from 4 ratings, while PrepFE averages 2.0 from 57 ratings.

### Do Engineering HandBook or PrepFE have ads?

Neither Engineering HandBook nor PrepFE shows ads.

### Which is updated more often, Engineering HandBook or PrepFE?

Engineering HandBook ships an update every 2 weeks, and PrepFE every 2 months. Most recently, Engineering HandBook was updated on June 8, 2026 and PrepFE on August 30, 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.*