# Engineering HandBook vs Mechanical Components

The clearest difference is rating: Engineering HandBook at 4.0 against Mechanical Components's 3.0. Engineering HandBook also leads on in-app purchases (none vs 4) and update cadence (every 2 weeks vs every 7 months). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Mechanical Components sells 4 in-app purchases, starting at $7.99 per 7 days. Engineering HandBook asks for nothing beyond the download.

Engineering HandBook holds the better App Store score, 4.0 against 3.0. Both are backed by a comparable volume of ratings — 4 and 2 respectively.

Engineering HandBook ships an update every 2 weeks, Mechanical Components every 7 months. Both last shipped on October 2, 2026.

## The numbers

| Metric | Engineering HandBook | Mechanical Components |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/engineering-handbook/id843746804/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/mechanical-components/id6738186476/reviews) |
| Number of ratings | **4** | 2 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 7 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 12 MB | 49 MB |
| Requires iOS | **6.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Raghu Srinivas](https://appshunter.io/developer/843746807) | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) |

## 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


### Mechanical Components

[App page](https://appshunter.io/ios/app/mechanical-components/id6738186476)

Test your knowledge of mechanical components with interactive quizzes. Features high-quality images, instant feedback, and multiple difficulty levels to help you master engineering parts. Ideal for students, DIY enthusiasts, and professionals.

**Highlights:** Interactive quizzes on mechanical parts, High-quality component images, Instant feedback and facts, Multiple difficulty levels, Learn and master engineering components

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Week | $7.99 | per 7 days |
| Month | $19.99 | per month |
| 6 months | $19.99 | per 6 months |
| Year | $29.99 | per year |


## Frequently asked questions

### Is Engineering HandBook free?

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

### Is Mechanical Components free?

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

### Which has better reviews, Engineering HandBook or Mechanical Components?

Engineering HandBook is rated higher. Engineering HandBook averages 4.0 out of 5 from 4 ratings, while Mechanical Components averages 3.0 from 2 ratings.

### Do Engineering HandBook or Mechanical Components have ads?

Neither Engineering HandBook nor Mechanical Components shows ads.

### Which is updated more often, Engineering HandBook or Mechanical Components?

Engineering HandBook ships an update every 2 weeks, and Mechanical Components every 7 months. Most recently, Engineering HandBook was updated on October 2, 2026 and Mechanical Components on October 2, 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.*