UnitConverter byNSDev vs US Unit Converter
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.
US Unit Converter
Easily convert between US customary units and the International System of Units for various measurements like length, weight, area, volume, and temperature. Access conversion history and remove ads with a premium upgrade.
- Length conversion
- Weight conversion
- Area conversion
- Liquid volume conversion
- Temperature conversion
- Conversion history
- Ad-free option
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"US Unit Converter" converts the units of length, weight, area, liquid volume, and temperature used in the United States into the International System of Units such as meters and kilograms. Select the category of the unit you want to convert at the top of the screen, enter the value, and you can convert immediately. The units that can be converted are as follows. [Unit of length] Meters [m], centimeters [cm], millimeters [mm], kilometers [km], inches [in], feet [ft], yards [yd], miles [mile] [Unit of weight] Kilogram [kg], gram [g], pound [lb], ounce [oz] [Unit of area] Square meters [m2], Are [a], hectares [ha], square kilometers [km2], square feet [ft2], square inches [in2], square miles [mi2], acres [acre], square yards [yd2] [Unit of liquid volume] Litre [L], milliliter [ml], fluid ounce [fl oz], cup [cup], pint [pt], quart [qt], gallon [gal] [Temperature unit] Celsius [℃], Fahrenheit [℉] In the free version, you can see only the previous data in the conversion history. If you want to see 100 historical data or hide ads, please consider purchasing the premium version in the app. ---------------------- Terms of Service and Privacy Policy: https://akikibai-labolatory.jimdofree.com/privacy-policy/
Screenshots
Verdict
The clearest difference is in-app purchases: UnitConverter byNSDev at none against US Unit Converter's 1. UnitConverter byNSDev also leads on ads (none vs shown). US Unit Converter's advantage is review sentiment (44% vs 20%). On price, update cadence, 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. US Unit Converter sells 1 one-off in-app purchase. UnitConverter byNSDev asks for nothing beyond the download.
UnitConverter byNSDev ships an update every 5 months, US Unit Converter every 6 months. The most recent releases landed on September 17, 2026 and September 22, 2026 respectively.
| Parameter | UnitConverter byNSDev | US Unit Converter |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.8 (108 ratings) — better |
| Positive reviews | 20.0% of reviews | 44.4% of reviews — better |
| Number of ratings | — | 108 — better |
| Update frequency | Every 5 months — better | Every 6 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 4 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | NIHON SYSTEM DEVELOPER CORPORATION | Kei Suefuji |
Customer experience
UnitConverter byNSDev
US Unit Converter
In-app purchases
UnitConverter byNSDev
No in-app purchases
US Unit Converter
- PREMIUM$3.99
Questions
Is UnitConverter byNSDev free?
Is US Unit Converter free?
Do UnitConverter byNSDev or US Unit Converter have ads?
Which is updated more often, UnitConverter byNSDev or US Unit Converter?
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