Comparison

Gear Calculator Pro vs Crowd Flasher

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Gear Calculator Pro

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
Read full description

The Gear Calculation App is a professional mechanical design tool tailored for engineers and mechanical enthusiasts. Whether you need to design gears, calculate gear parameters, or optimize mechanical transmission systems, this app can meet your needs. With its simple and intuitive interface and powerful calculation functions, you can easily calculate key parameters such as gear module, number of teeth, pressure angle, pitch diameter, and addendum circle diameter. Main Features: Accurate Calculations: Supports precise calculations for various gear types, including spur gears, helical gears, worm gears, and more, ensuring that your design data is highly accurate. Custom Parameters: Allows users to input custom parameters and adjust gear design and calculation methods as needed. Real-time Preview: Calculation results are instantly visible, helping you quickly verify the feasibility of your design. Efficient Tools: Includes a variety of commonly used formulas and tools, simplifying the gear design and analysis process. User-friendly: Easy to operate, suitable for users of all levels, from beginners to professional engineers. Whether you are engaged in mechanical design work or studying gear mechanics, this app will become an indispensable assistant for you. Download the Gear Calculation App now and start optimizing your designs!

About

Crowd Flasher

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
Read full description

Type a message and flash it to the crowd! Perfect for sports events, concerts, and more, this app lets you display custom text with vibrant backgrounds on your device. Ditch the hassle of carrying a bulky sign—just pull out your phone and shine your message loud and clear. Choose from various themes, customize colors, and make your message stand out. Easy to use and perfect for any event!

Screenshots

Gear Calculator Pro2 screens
Crowd Flasher4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
Gear Calculator Pro versus Crowd Flasher: the parameters behind the verdict, then further details
ParameterGear Calculator ProCrowd Flasher
PriceFreeFree
Rating5.0 (1 ratings)5.0 (5 ratings)
Positive reviews—100.0% of reviews
Number of ratings15 — better
Update frequencyEvery 4 daysDaily — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS13.0 — better16.0
Further details — not scored
Size6 MB63 MB
Age rating4+4+
Developer志桂 李Rig-A-Roo LLC Studios

Customer experience

Gear Calculator Pro

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Crowd Flasher

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Gear Calculator Pro

One-time1
  • 永久会员$9.99
1 purchases

Crowd Flasher

One-time1
  • Remove Ads$4.99

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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