CONVERT UNITS vs Unit Converter Simple
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CONVERT UNITS
Easily convert between various units of measurement including length, weight, temperature, and currency. Features automatic currency updates, a vast selection of currencies, and customizable display options for accuracy and rounding. Optimized for multitasking on iPad and offers a beautiful dark design.
- Converts length, weight, speed, area, time, pressure, volume, power, fuel, temperature, data, and currency
- Automatic currency updates
- 160 currencies available
- Multitasking enabled for iPad
- Alphabetical quick links for units
- Customizable startup categories
- Adjustable accuracy and rounding
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CONVERT UNITS is built for the numbers a general converter treats as an afterthought: torque, pressure, viscosity, density, thermal conductivity, magnetic flux density, radioactivity, luminance. Close to 40 of its 72 categories are scientific and engineering categories, covering 685 units in total, in a fast, no-nonsense dark interface built to do one thing: give you the answer and get out of the way. Two scrolling lists, a big keypad, and a result that updates as you type. 72 CATEGORIES, 685 UNITS Torque, pressure, viscosity, density, thermal conductivity, magnetic flux density, radioactivity, luminance — plus length, weight, temperature, speed, area, volume, time, power, energy, data, fuel economy and dozens more. CURRENCY, CRYPTO AND METALS - 160 world currencies, with rates refreshed daily. - 126 cryptocurrencies. - Gold, silver, platinum and palladium. - Update rates automatically, once a day, on every launch, or only when you ask. BUILT TO BE FAST - An alphabetical index down the side of every list - jump straight to a unit instead of scrolling past hundreds. - Search every unit in every category from a single field. - Launch straight into the category you actually use and skip the home screen entirely. - Hide the categories you never touch, so the grid stays yours. PRECISION ON YOUR TERMS - Trim results by significant figures or by decimal places, whichever the spec calls for. - Significant figures keep small numbers detailed: 0.030333 at 3 figures gives 0.0303. - Decimal places line every result up on the same column: 2 places gives 13.78. - Round results up, or leave them exact. THE DETAILS - 33 languages: English, Spanish, French, German, Portuguese, Italian, Japanese, Korean, Chinese (Simplified), Chinese (Traditional), Russian, Arabic, Hindi, Thai, Turkish, Vietnamese, Swedish, Norwegian, Danish, Dutch, Romanian, Ukrainian, Czech, Polish, Croatian, Hungarian, Slovak, Malay, Indonesian, Urdu, Tamil, Telugu, and Bangla. - iPhone and iPad, with a layout built for each, plus Split View so you can convert alongside another app. - Mute the keypad and lock rotation if you prefer. - A dark design with bold, readable figures. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://developer-yl.github.io/convert-units/privacy.html
Unit Converter Simple
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A free app that easily converts units such as length and weight into other units. You can easily convert meters to kilometers, grams to kilograms, and so on. In addition, the converted values are displayed in a list, so you can check them immediately. You can hide the units you don't need, so you can see only the units you want to see. It corresponds to various units. [Unit List] Length, Weight, Area, Volume, Angle, Time, Speed, Temperature, Force, Pressure, Acceleration, Energy [Each Unit] Length: Metre, Foot, Inch, etc. Weight: Gram, Kilogram, Pound, etc. Area: Square metre, Square foot, Hectare, etc. Volume: Litre, Cubic centimetre, Gallon, etc. Angle: Degree, Minute, Radian, etc. Time: Second, Hour, Day, etc. Speed: Metre per second, Mile per hour, Knot, etc. Temperature: Celsius, Fahrenheit, Kelvin, etc. Force: Kilogram-force, Newton, Poundal, etc. Pressure: Pascal, Hectopascal, Bar, etc. Acceleration: Metre per second squared, Gal, etc. Energy: Joule, Erg, Foot-poundal, etc.
Screenshots
Verdict
The clearest difference is update cadence: CONVERT UNITS at every 6 weeks against Unit Converter Simple's every 10 months. Unit Converter Simple's advantage is iOS requirement (13.0 vs 15.0). 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. Neither carries in-app purchases, so what you see is what you pay.
CONVERT UNITS ships an update every 6 weeks, Unit Converter Simple every 10 months. The most recent releases landed on September 25, 2026 and September 21, 2026 respectively.
| Parameter | CONVERT UNITS | Unit Converter Simple |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (1.4K ratings) — better | — |
| Positive reviews | 75.0% of reviews | — |
| Number of ratings | 1.4K — better | — |
| Update frequency | Every 6 weeks — better | Every 10 months |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 21 MB | 18 MB |
| Age rating | +4 | 4+ |
| Developer | Adysseus | Kouji Yamauchi |
Bugs and requests
CONVERT UNITS
Reported bugs
2 issues- App got stuck, required uninstall/reinstall to fix
- Navigation issues, unable to get back to home page
Requested features
2 requests- Option to convert between functions (length to volume)
- Remember last conversion settings for each category
Unit Converter Simple
Not enough reviews yet to summarise bugs or requests.
In-app purchases
CONVERT UNITS
No in-app purchases
Unit Converter Simple
No in-app purchases
Questions
Is CONVERT UNITS free?
Is Unit Converter Simple free?
Do CONVERT UNITS or Unit Converter Simple have ads?
Which is updated more often, CONVERT UNITS or Unit Converter Simple?
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