# CSiUnits vs mechanical design engine

The clearest difference is update cadence: CSiUnits at monthly against mechanical design engine's every 2 months. CSiUnits also leads on iOS requirement (9.0 vs 13.0). 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.

CSiUnits ships an update monthly, mechanical design engine every 2 months. The most recent releases landed on September 17, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | CSiUnits | mechanical design engine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/csiunits/id1344138128/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free | — |
| Size | 13 MB | 63 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Computers and Structures, Inc.](https://appshunter.io/developer/1119970032) | [gan dae choi](https://appshunter.io/developer/1574341439) |

## What reviewers say

### CSiUnits

[App page](https://appshunter.io/ios/app/csiunits/id1344138128)

This application provides a comprehensive tool for converting units across various scientific disciplines and everyday needs. It offers over 70 conversion options, catering to professionals, students, and anyone requiring precise unit transformations.

**Highlights:** Multiple one-time conversion lists, Conversions for lifestyle and science, Over 70 conversion options, Numeric value input, Converted values to all possible units

**In-app purchases:** none


### mechanical design engine

[App page](https://appshunter.io/ios/app/mechanical-design-engine/id1574341437)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CSiUnits free?

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

### Is mechanical design engine free?

mechanical design engine is free to download, with no in-app purchases.

### Do CSiUnits or mechanical design engine have ads?

Neither CSiUnits nor mechanical design engine shows ads.

### Which is updated more often, CSiUnits or mechanical design engine?

CSiUnits ships an update monthly, and mechanical design engine every 2 months. Most recently, CSiUnits was updated on September 17, 2026 and mechanical design engine on October 11, 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.*