# mechanical design engine vs Gear Calculator Pro

The clearest difference is in-app purchases: mechanical design engine at none against Gear Calculator Pro's 1. Gear Calculator Pro's advantage is update cadence (every 4 days vs every 2 months) and device support (4 vs 2). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Gear Calculator Pro sells 1 one-off in-app purchase. mechanical design engine asks for nothing beyond the download.

mechanical design engine ships an update every 2 months, Gear Calculator Pro every 4 days. Both last shipped on November 3, 2026.

## The numbers

| Metric | mechanical design engine | Gear Calculator Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/gear-calculator-pro/id6463792360/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 63 MB | 6 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [gan dae choi](https://appshunter.io/developer/1574341439) | [志桂 李](https://appshunter.io/developer/1686507153) |

## What reviewers say

### mechanical design engine

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Gear Calculator Pro

[App page](https://appshunter.io/ios/app/gear-calculator-pro/id6463792360)

This professional mechanical design tool helps engineers and enthusiasts calculate and optimize various gear parameters. It offers accurate calculations for different gear types, custom parameter input, and real-time design previews.

**Highlights:** Accurate calculations for spur, helical, and worm gears, Customizable design parameters, Real-time calculation previews, Efficient gear design formulas and tools, User-friendly interface for all levels

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 永久会员 | $9.99 | one-time |


## Frequently asked questions

### Is mechanical design engine free?

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

### Is Gear Calculator Pro free?

Gear Calculator Pro is free to download, with in-app purchases available.

### Do mechanical design engine or Gear Calculator Pro have ads?

Neither mechanical design engine nor Gear Calculator Pro shows ads.

### Which is updated more often, mechanical design engine or Gear Calculator Pro?

mechanical design engine ships an update every 2 months, and Gear Calculator Pro every 4 days. Most recently, mechanical design engine was updated on November 3, 2026 and Gear Calculator Pro on November 3, 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.*