UnitConverter byNSDev vs Engineering Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
UnitConverter byNSDev
This tool converts between 26 different types of units, displaying conversion rates and allowing you to specify decimal places. It supports a vast array of units across categories like length, mass, volume, and more.
- Converts 26 types of units
- Displays conversion rates
- Customizable decimal places
- Supports numerous units in various categories
- User-submitted unit requests
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Tool to convert each of 26 types of units. When you select a unit of value that you enter, you create a table to calculate all the other units. It also displays the conversion rate. You can also specify the number of decimal places. 23 units in Length 18 units in Area 31 units in Volume 15 units in Mass 5 units in Angle 4 units in Temperature 7 units in Time 3 units in Frequency 5 units in Force 17 units in Pressure 6 units in Energy 6 units in Power rate 13 units in Speed 14 units in Acceleration 2 units in Dynamic viscosity 4 units in Kinematic viscosity 3 units in Magnetic flux density 2 units in Magnetic flux 7 units in Luminance 4 units in Illuminance 3 units in Radiation - source activity 2 units in Radiation - absorbed dose 2 units in Radiation - equivalent dose 2 units in Radiation - exposure 7 units in Infomation 7 units in Resolution Because we want to support units around the world, We will wait for the name and unit conversion information. Please enter your review.
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。
Screenshots
Verdict
The clearest difference is ads: UnitConverter byNSDev at none against Engineering Calculator's shown. UnitConverter byNSDev also leads on monetization model (free vs ad-supported). Engineering Calculator's advantage is update cadence (monthly vs every 5 months) and iOS requirement (12.2 vs 15.6). On price, in-app purchases and device support 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. Neither carries in-app purchases, so what you see is what you pay.
UnitConverter byNSDev ships an update every 5 months, Engineering Calculator monthly. The most recent releases landed on October 4, 2026 and September 23, 2026 respectively.
| Parameter | UnitConverter byNSDev | Engineering Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.5 (2 ratings) — better |
| Positive reviews | 20.0% of reviews | — |
| Number of ratings | — | 2 — better |
| Update frequency | Every 5 months | Monthly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 12.2 — better |
| Further details — not scored | ||
| Size | 4 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | NIHON SYSTEM DEVELOPER CORPORATION | Masato Kanazawa |
Customer experience
UnitConverter byNSDev
Engineering Calculator
In-app purchases
UnitConverter byNSDev
No in-app purchases
Engineering Calculator
No in-app purchases
Questions
Is UnitConverter byNSDev free?
Is Engineering Calculator free?
Do UnitConverter byNSDev or Engineering Calculator have ads?
Which is updated more often, UnitConverter byNSDev or Engineering Calculator?
Other comparisons
