# Gear Calculator Pro vs Crowd Flasher

The clearest difference is ads: Gear Calculator Pro at none against Crowd Flasher's shown. Gear Calculator Pro also leads on device support (4 vs 2) and iOS requirement (13.0 vs 16.0). Crowd Flasher's advantage is update cadence (daily vs every 4 days) and ratings volume (5 vs 1). On price, rating, in-app purchases and monetization model there is nothing between them.

Both are free to download. Gear Calculator Pro sells 1 one-off in-app purchase and Crowd Flasher sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Gear Calculator Pro against 5.0 for Crowd Flasher. That said, the two scores are not equally well evidenced: Crowd Flasher has 5 ratings behind it against 1, so its average is the more settled of the two.

Gear Calculator Pro ships an update every 4 days, Crowd Flasher daily. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Gear Calculator Pro | Crowd Flasher |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/gear-calculator-pro/id6463792360/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/crowd-flasher/id6741052744/reviews) |
| Number of ratings | 1 | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 days | **Daily** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 6 MB | 63 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [志桂 李](https://appshunter.io/developer/1686507153) | [Rig-A-Roo LLC Studios](https://appshunter.io/developer/1792763823) |

## 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 |


### Crowd Flasher

[App page](https://appshunter.io/ios/app/crowd-flasher/id6741052744)

Display custom text messages with vibrant backgrounds on your device. Ideal for events like sports games and concerts, it allows you to easily share your message without needing a physical sign. Customize colors and themes to make your announcement stand out.

**Highlights:** Custom text messaging, Vibrant backgrounds, Event-ready display, Theme customization, Color customization, Easy to use

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $4.99 | one-time |


## Frequently asked questions

### Is Gear Calculator Pro free?

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

### Is Crowd Flasher free?

Crowd Flasher is free to download, with in-app purchases available.

### Which has better reviews, Gear Calculator Pro or Crowd Flasher?

Gear Calculator Pro and Crowd Flasher are both rated 5.0 out of 5 on the App Store, from 1 and 5 ratings respectively.

### Do Gear Calculator Pro or Crowd Flasher have ads?

Crowd Flasher shows ads; Gear Calculator Pro does not.

### Which is updated more often, Gear Calculator Pro or Crowd Flasher?

Gear Calculator Pro ships an update every 4 days, and Crowd Flasher daily. Most recently, Gear Calculator Pro was updated on November 3, 2026 and Crowd Flasher on November 4, 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.*