# Engineering HandBook vs Mechanical Formula

The clearest difference is rating: Mechanical Formula at 4.7 against Engineering HandBook's 4.0. Mechanical Formula also leads on ratings volume (34 vs 4). Engineering HandBook's advantage is in-app purchases (none vs 1) and update cadence (every 2 weeks vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Mechanical Formula sells 1 one-off in-app purchase. Engineering HandBook asks for nothing beyond the download.

Mechanical Formula holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: Mechanical Formula has 34 ratings behind it against 4, so its average is the more settled of the two.

Engineering HandBook ships an update every 2 weeks, Mechanical Formula every 4 months. The most recent releases landed on October 2, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Engineering HandBook | Mechanical Formula |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/engineering-handbook/id843746804/reviews) | **[4.7 (34 ratings)](https://appshunter.io/ios/app/mechanical-formula/id1668948373/reviews)** |
| Number of ratings | 4 | **34** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 4 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 12 MB | 42 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) | [Kantaben Gorasiya](https://appshunter.io/developer/1640260396) |

## 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 Formula

[App page](https://appshunter.io/ios/app/mechanical-formula/id1668948373)

This app provides over 200 essential mechanical engineering formulas and calculations in a user-friendly tool. It's designed to simplify complex concepts and speed up problem-solving for students, professionals, and educators.

**Highlights:** 200+ mechanical engineering formulas, Instant calculations, Intuitive interface, Real-world application explanations, Exam preparation aid, Lifetime Premium option

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is Engineering HandBook free?

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

### Is Mechanical Formula free?

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

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

Mechanical Formula is rated higher. Engineering HandBook averages 4.0 out of 5 from 4 ratings, while Mechanical Formula averages 4.7 from 34 ratings.

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

Neither Engineering HandBook nor Mechanical Formula shows ads.

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

Engineering HandBook ships an update every 2 weeks, and Mechanical Formula every 4 months. Most recently, Engineering HandBook was updated on October 2, 2026 and Mechanical Formula on October 6, 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.*