# Engineering Calculator vs Protractor Edge

The clearest difference is rating: Engineering Calculator at 4.5 against Protractor Edge's 4.0. Engineering Calculator also leads on in-app purchases (none vs 2). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Protractor Edge sells 2 one-off in-app purchases. Engineering Calculator asks for nothing beyond the download.

Engineering Calculator holds the better App Store score, 4.5 against 4.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

Engineering Calculator ships an update monthly, Protractor Edge every 6 weeks. The most recent releases landed on September 23, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Engineering Calculator | Protractor Edge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/engineering-calculator/id1395510375/reviews)** | [4.0 (2 ratings)](https://appshunter.io/ios/app/protractor-edge-angle-measure/id1499078532/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Monthly** | Every 6 weeks |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 1 MB | 17 MB |
| Requires iOS | **12.2** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | +4 |
| Developer | [Masato Kanazawa](https://appshunter.io/developer/1110570349) | [向阳 杨](https://appshunter.io/developer/1174757734) |

## What reviewers say

### Engineering Calculator

[App page](https://appshunter.io/ios/app/engineering-calculator/id1395510375)

This utility app helps users convert units and calculate tips, primarily for those in the US. It operates offline and aims for minimal user interaction to provide quick results. Useful for avoiding misunderstandings in business dealings due to unit differences.

**Highlights:** Unit conversion, Tip calculation, Offline functionality, Minimalist interface, Business negotiation aid

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

**In-app purchases:** none


### Protractor Edge

[App page](https://appshunter.io/ios/app/protractor-edge-angle-measure/id1499078532)

This utility app functions as a precise digital protractor for measuring angles on your device. It offers a smart instrument for accurate angle measurement, supporting iPhone and iPad. The app is free to download and use.

**Highlights:** Precise angle measurement, Smart instrument, Digital protractor, Supports iPhone and iPad

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support for a cup of coffee | $1.99 | one-time |
| Ads-free experience | $1.99 | one-time |


## Frequently asked questions

### Is Engineering Calculator free?

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

### Is Protractor Edge free?

Protractor Edge is free to download, with in-app purchases available.

### Which has better reviews, Engineering Calculator or Protractor Edge?

Engineering Calculator is rated higher. Engineering Calculator averages 4.5 out of 5 from 2 ratings, while Protractor Edge averages 4.0 from 2 ratings.

### Do Engineering Calculator or Protractor Edge have ads?

Both Engineering Calculator and Protractor Edge show ads.

### Which is updated more often, Engineering Calculator or Protractor Edge?

Engineering Calculator ships an update monthly, and Protractor Edge every 6 weeks. Most recently, Engineering Calculator was updated on September 23, 2026 and Protractor Edge on October 7, 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.*