# Engineering HandBook vs Roughness

The clearest difference is update cadence: Engineering HandBook at every 2 weeks against Roughness's every 14 months. Engineering HandBook also leads on iOS requirement (6.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Engineering HandBook ships an update every 2 weeks, Roughness every 14 months. The most recent releases landed on June 8, 2026 and March 5, 2026 respectively.

## The numbers

| Metric | Engineering HandBook | Roughness |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/engineering-handbook/id843746804/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 14 months |
| Monetization | Free | — |
| Size | 12 MB | 26 MB |
| Requires iOS | **6.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Raghu Srinivas](https://appshunter.io/developer/843746807) | [Carl Zeiss AG](https://appshunter.io/developer/488066215) |

## 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


### Roughness

[App page](https://appshunter.io/ios/app/roughness/id1356085703)

**In-app purchases:** none


## Frequently asked questions

### Is Engineering HandBook free?

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

### Is Roughness free?

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

### Do Engineering HandBook or Roughness have ads?

Neither Engineering HandBook nor Roughness shows ads.

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

Engineering HandBook ships an update every 2 weeks, and Roughness every 14 months. Most recently, Engineering HandBook was updated on June 8, 2026 and Roughness on March 5, 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.*