# Spur Gear Calculator vs Flash Studio

The clearest difference is rating: Flash Studio at 4.8 against Spur Gear Calculator's 3.7. Flash Studio also leads on update cadence (fortnightly vs every 12 months) and ratings volume (5.5K vs 3). Spur Gear Calculator's advantage is review sentiment (100% vs 58%) and ads (none vs shown). On price, 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.

Flash Studio holds the better App Store score, 4.8 against 3.7. That said, the two scores are not equally well evidenced: Flash Studio has 5.5K ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 100% of Spur Gear Calculator's written reviews are positive against 58% of Flash Studio's, so the app with the better star average is not the one people write more warmly about.

Spur Gear Calculator ships an update every 12 months, Flash Studio fortnightly. The most recent releases landed on October 23, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Spur Gear Calculator | Flash Studio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/spur-gear-calculator/id827110560/reviews) | **[4.8 (5.5K ratings)](https://appshunter.io/ios/app/flash-studio/id6756779254/reviews)** |
| Number of ratings | 3 | **5.5K** |
| Positive reviews | **100.0% of reviews** | 58.4% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 12 months | **Fortnightly** |
| Monetization | **Free** | Ad-supported |
| Size | 11 MB | 100 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SpiralArm Consulting Limited](https://appshunter.io/developer/836987822) | [浙江闪铸三维科技有限公司](https://appshunter.io/developer/999198567) |

## What reviewers say

### Spur Gear Calculator

[App page](https://appshunter.io/ios/app/spur-gear-calculator/id827110560)

Calculate essential dimensions for spur gears and pinions using diametral pitch or module. This tool provides outside diameter, center distance, and ratio for specific gear types.

**Highlights:** Calculate Outside Diameter, Calculate Centre Distance, Calculate Ratio, Supports Diametral Pitch, Supports Module, Spur gear and pinion specific

**In-app purchases:** none


### Flash Studio

[App page](https://appshunter.io/ios/app/flash-studio/id6756779254)

Manage your 3D printers remotely from your smartphone. Monitor print status, view live video feeds of your printer's operations, and control multiple printers simultaneously.

**Highlights:** Remote printer monitoring, Real-time video feed, Manage grouped printers, On-the-go management, Smartphone integration

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Spur Gear Calculator free?

Spur Gear Calculator is free to download, with no in-app purchases.

### Is Flash Studio free?

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

### Which has better reviews, Spur Gear Calculator or Flash Studio?

Flash Studio is rated higher. Spur Gear Calculator averages 3.7 out of 5 from 3 ratings, while Flash Studio averages 4.8 from 5.5K ratings.

### Do Spur Gear Calculator or Flash Studio have ads?

Flash Studio shows ads; Spur Gear Calculator does not.

### Which is updated more often, Spur Gear Calculator or Flash Studio?

Spur Gear Calculator ships an update every 12 months, and Flash Studio fortnightly. Most recently, Spur Gear Calculator was updated on October 23, 2026 and Flash Studio on October 26, 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.*