Engineering Calculator vs Protractor Edge
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Engineering Calculator
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.
- Unit conversion
- Tip calculation
- Offline functionality
- Minimalist interface
- Business negotiation aid
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米国（アメリカ）で生活するエンジニアのための単位換算、チップ計算ができるアプリです。 特にエンジニアである必要もないですが。。。 オフラインで動作可能、広告もありません。 極力少ない操作で結果が出るようになっています。 米国企業などと商談を行うときには単位の相違によって誤解が生じることが多々あります。 このアプリを使って手早く単位変換ができれば、早く理解出来、結果商談の成功に繋がります。
Protractor Edge
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.
- Precise angle measurement
- Smart instrument
- Digital protractor
- Supports iPhone and iPad
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Protractor - smart instrument to measure angles. Support: https://k1er.github.io/
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Engineering Calculator | Protractor Edge |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (2 ratings) — better | 4.0 (2 ratings) |
| Positive reviews | — | 66.7% of reviews |
| Number of ratings | 2 | 2 |
| Update frequency | Monthly — better | Every 6 weeks |
| Ads | Yes | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.2 — better | 13.0 |
| Further details — not scored | ||
| Size | 1 MB | 17 MB |
| Age rating | 4+ | +4 |
| Developer | Masato Kanazawa | 向阳 杨 |
Customer experience
Engineering Calculator
Protractor Edge
In-app purchases
Engineering Calculator
No in-app purchases
Protractor Edge
- Support for a cup of coffee$1.99
- Ads-free experience$1.99
Questions
Is Engineering Calculator free?
Is Protractor Edge free?
Which has better reviews, Engineering Calculator or Protractor Edge?
Do Engineering Calculator or Protractor Edge have ads?
Which is updated more often, Engineering Calculator or Protractor Edge?
Other comparisons
