# Gear Calculator Pro vs Gemba Observations 2

The clearest difference is in-app purchases: Gemba Observations 2 at none against Gear Calculator Pro's 1. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Gear Calculator Pro sells 1 one-off in-app purchase. Gemba Observations 2 asks for nothing beyond the download.

## The numbers

| Metric | Gear Calculator Pro | Gemba Observations 2 |
| --- | --- | --- |
| 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 | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 days | — |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 49 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [志桂 李](https://appshunter.io/developer/1686507153) | [Ventolines B.V.](https://appshunter.io/developer/1116980907) |

## What reviewers say

### 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 |


### Gemba Observations 2

[App page](https://appshunter.io/ios/app/gemba-observations-2/id6738940793)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Gear Calculator Pro free?

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

### Is Gemba Observations 2 free?

Gemba Observations 2 is free to download, with no in-app purchases.

### Do Gear Calculator Pro or Gemba Observations 2 have ads?

Neither Gear Calculator Pro nor Gemba Observations 2 shows ads.

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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.*