# Spur Gear Calculator vs Protractor for Angle Measuring

The clearest difference is review sentiment: Spur Gear Calculator at 100% against Protractor for Angle Measuring's 48%. Spur Gear Calculator also leads on in-app purchases (none vs 5) and ads (none vs shown). Protractor for Angle Measuring's advantage is rating (4.5 vs 3.7) and update cadence (every 3 weeks vs every 12 months). On price and device support there is nothing between them.

Both are free to download. Protractor for Angle Measuring sells 5 in-app purchases, starting at $0.99 per 7 days. Spur Gear Calculator asks for nothing beyond the download.

Protractor for Angle Measuring holds the better App Store score, 4.5 against 3.7. That said, the two scores are not equally well evidenced: Protractor for Angle Measuring has 1.1K 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 48% of Protractor for Angle Measuring'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, Protractor for Angle Measuring every 3 weeks. The most recent releases landed on November 1, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | Spur Gear Calculator | Protractor for Angle Measuring |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/spur-gear-calculator/id827110560/reviews) | **[4.5 (1.1K ratings)](https://appshunter.io/ios/app/protractor-for-angle-measuring/id6474609160/reviews)** |
| Number of ratings | 3 | **1.1K** |
| Positive reviews | **100.0% of reviews** | 48.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 12 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 11 MB | 120 MB |
| Requires iOS | **8.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SpiralArm Consulting Limited](https://appshunter.io/developer/836987822) | [AppLiks Sp. z O.O.](https://appshunter.io/developer/1804335622) |

## 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


### Protractor for Angle Measuring

[App page](https://appshunter.io/ios/app/protractor-for-angle-measuring/id6474609160)

Transform your iPhone into a precision angle measurement tool. Effortlessly assess angles in real-time using touch and camera modes, measure multiple angles simultaneously, and customize your tools for accuracy and simplicity. Ideal for quick, reliable on-the-go assessments.

**Highlights:** Real-time angle measurement, Touch and camera modes, Simultaneous measurement of unlimited angles, Plumb bob pendulum for tilt determination, Tool color customization, Measure angles in photos

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Access | $0.99 | per 7 days |
| Weekly Access with Trial | $1.99 | per 7 days |
| Weekly Access | $1.99 | per 7 days |
| Yearly Access | $3.99 | per year |
| Yearly Access | $4.99 | per year |

**What reviewers like**

- 👍 Useful for surveying and measuring angles
- 💡 Interesting use of camera to overlay protractor
- 👍 Helps with specific use cases like golf setup
- 👍 Provides a clutter-free protractor experience

**What reviewers complain about**

- 🐛 Difficulty using the protractor tool and angle measurement
- 🐛 Inability to zoom in/out when measuring angles in photos
- 🐛 Inaccurate angle measurements in some cases

**Reported bugs**

- Protractor tool is hard to use and requires multiple tries
- Angle measurements do not match real-world angles

**Requested features**

- Add more instructions and guidance for using the protractor tool
- Improve the zoom functionality when measuring angles in photos
- Enhance the accuracy of angle measurements


## Frequently asked questions

### Is Spur Gear Calculator free?

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

### Is Protractor for Angle Measuring free?

Protractor for Angle Measuring is free to download, with in-app purchases available.

### Which has better reviews, Spur Gear Calculator or Protractor for Angle Measuring?

Protractor for Angle Measuring is rated higher. Spur Gear Calculator averages 3.7 out of 5 from 3 ratings, while Protractor for Angle Measuring averages 4.5 from 1.1K ratings.

### Do Spur Gear Calculator or Protractor for Angle Measuring have ads?

Protractor for Angle Measuring shows ads; Spur Gear Calculator does not.

### Which is updated more often, Spur Gear Calculator or Protractor for Angle Measuring?

Spur Gear Calculator ships an update every 12 months, and Protractor for Angle Measuring every 3 weeks. Most recently, Spur Gear Calculator was updated on November 1, 2026 and Protractor for Angle Measuring on November 12, 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.*