Engineering Calculator vs Smart Unit Conversion
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。
Smart Unit Conversion
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This is a smart unit convertor that: 1. Support 21 languages and the Local Units 2. You can Customize the Sequence of Units 3. European number format supported Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Engineering Calculator at none against Smart Unit Conversion's 1. Engineering Calculator also leads on update cadence (monthly vs every 15 months). On price, ads, device support and iOS requirement 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. Smart Unit Conversion sells 1 in-app purchase, starting at $1.99 per year. Engineering Calculator asks for nothing beyond the download.
Engineering Calculator ships an update monthly, Smart Unit Conversion every 15 months. The most recent releases landed on September 23, 2026 and October 8, 2026 respectively.
| Parameter | Engineering Calculator | Smart Unit Conversion |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | Monthly — better | Every 15 months |
| Ads | Yes | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.2 — better | 13.4 |
| Further details — not scored | ||
| Size | 1 MB | 41 MB |
| Age rating | 4+ | 17+ |
| Developer | Masato Kanazawa | Yui Lau |
In-app purchases
Engineering Calculator
No in-app purchases
Smart Unit Conversion
- 1 Year$1.991 Year
Questions
Is Engineering Calculator free?
Is Smart Unit Conversion free?
Do Engineering Calculator or Smart Unit Conversion have ads?
Which is updated more often, Engineering Calculator or Smart Unit Conversion?
Other comparisons
