US Unit Converter vs Smart Unit Conversion
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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/
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 update cadence: US Unit Converter at every 6 months against Smart Unit Conversion's every 15 months. Smart Unit Conversion's advantage is iOS requirement (13.4 vs 15.6). On price, ads, 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. US Unit Converter sells 1 one-off in-app purchase and Smart Unit Conversion sells 1 in-app purchase, starting at $1.99 per year. Whichever you choose, the download price is not the number that matters.
US Unit Converter ships an update every 6 months, Smart Unit Conversion every 15 months. The most recent releases landed on October 14, 2026 and October 8, 2026 respectively.
| Parameter | US Unit Converter | Smart Unit Conversion |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (109 ratings) — better | — |
| Positive reviews | 44.4% of reviews | — |
| Number of ratings | 109 — better | — |
| Update frequency | Every 6 months — better | Every 15 months |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 13.4 — better |
| Further details — not scored | ||
| Size | 6 MB | 41 MB |
| Age rating | 4+ | 17+ |
| Developer | Kei Suefuji | Yui Lau |
In-app purchases
US Unit Converter
- PREMIUM$3.99
Smart Unit Conversion
- 1 Year$1.991 Year
Questions
Is US Unit Converter free?
Is Smart Unit Conversion free?
Do US Unit Converter or Smart Unit Conversion have ads?
Which is updated more often, US Unit Converter or Smart Unit Conversion?
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