Comparison

Units Converter for Engineers vs CONVERT UNITS

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Units Converter for Engineers

This tool allows professionals and students to convert units and currencies using dimensional analysis. It supports a vast number of unit combinations and includes physical constants. Currency rates are updated monthly.

Highlights
  • Free-form unit conversion via dimensional analysis
  • Supports over 300 single units
  • Supports over 165 currencies with automatic updates
  • Includes dozens of physical constants
  • Identifies unit mismatches
  • Glossary of available units
Features
Read full description

Units Converter is a free-form units conversion tool designed for professionals and students of science and engineering. This is the only Units and Currency conversion app you will ever need. It is based on fundamental principle of dimensional analysis which allows you to enter your unit in any form (instead of picking from a predefined list). This method therefore supports any number of combinations. For example: It can effortlessly convert Energy in ton-TNT (tTNT) to kg-km^2/hr^2. If there is a units mismatch, it will identify missing units. Plus dozens of physical constants such as speed of sound, speed of light, gravitation constant, etc. are built-in and can be retrieved by entering their symbol. Supports over 300 single units and over 165 currencies. Currency rates are automatically updated about once a month. Includes prices of gold (XAU), silver (XAG), platinum (XPT), etc. Help notes provide a detailed glossary of all units available. In free version, first text field is locked to a value of 1 and cannot be edited. Purchase 'Unlock all features' on the App Store to enable editing. Check it out.

About

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.

Highlights
  • 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
Features
Read full description

160 currencies · 126 cryptocurrencies · 685 units across 72 categories CONVERT ANYWHERE, EVEN OFFLINE Convert units without an internet connection. Currency and crypto conversions use your saved rates offline; an internet connection is needed to refresh rates. • No Full Screen Ads • Find units quickly with search and an alphabetical index • Control precision with decimal places and significant figures • Choose your starting category and hide categories you don’t use • Personalize your colors with curated or custom themes, available with Premium Designed for iPhone and iPad, with Split View support Dark and light appearance support CONVERSION CATEGORIES Everyday conversions Length, weight, temperature, area, volume, speed, time, fuel economy, pace, data, data transfer rate, angle, shoe sizes, ring sizes, amount, image resolution, typography and blood sugar Engineering and mechanics Pressure, torque, force, energy, power, acceleration, angular acceleration, moment of inertia, density, specific volume, flow, mass flux density, surface tension, viscosity, kinematic viscosity and permeability Electricity and magnetism Current, voltage, resistance, charge, frequency, capacitance, inductance, conductance, electric field strength, electric resistivity, electric conductivity, magnetic flux, magnetic field strength, magnetic flux density, magnetomotive force, linear charge density, surface charge density, volume charge density, linear current density and surface current density Heat and temperature Temperature interval, thermal conductivity, specific heat capacity, heat density, heat flux density, heat transfer coefficient and thermal expansion Chemistry Molar concentration, molar mass and molar flow rate Light, sound and radiation Luminance, illumination, luminous intensity, sound, radiation, radioactivity and exposure Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://developer-yl.github.io/convert-units/privacy.html

Screenshots

Units Converter for Engineers4 screens
CONVERT UNITS4 screens

Verdict

The call

The clearest difference is rating: CONVERT UNITS at 4.7 against Units Converter for Engineers's 3.0. CONVERT UNITS also leads on review sentiment (76% vs 50%) and ratings volume (1.4K vs 2). Units Converter for Engineers's advantage is ads (none vs shown). On price, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Units Converter for Engineers sells 2 one-off in-app purchases and CONVERT UNITS sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

CONVERT UNITS holds the better App Store score, 4.7 against 3.0. That said, the two scores are not equally well evidenced: CONVERT UNITS has 1.4K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 50% of Units Converter for Engineers's written reviews are positive against 76% of CONVERT UNITS's.

UpkeepUpdate frequency

Units Converter for Engineers ships an update every 5 weeks, CONVERT UNITS every 9 days. The most recent releases landed on September 19, 2026 and October 26, 2026 respectively.

Scorecard7 real differences · 3 level
Units Converter for Engineers versus CONVERT UNITS: the parameters behind the verdict, then further details
ParameterUnits Converter for EngineersCONVERT UNITS
PriceFreeFree
Rating3.0 (2 ratings)4.7 (1.4K ratings) — better
Positive reviews50.0% of reviews75.8% of reviews — better
Number of ratings21.4K — better
Update frequencyEvery 5 weeksEvery 9 days — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS16.615.0 — better
Further details — not scored
Size5 MB22 MB
Age rating4+4+
DeveloperLucy EnterprisesAdysseus

Customer experience

Units Converter for Engineers

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

CONVERT UNITS

All ratings1,377 ratings
Positive94.0%
Neutral3.2%
Negative2.8%
Written reviews33 reviews
Positive75.8%
Neutral6.1%
Negative18.2%

Bugs and requests

Units Converter for Engineers

Not enough reviews yet to summarise bugs or 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

In-app purchases

2 purchases

Units Converter for Engineers

One-time2
  • Unlock all features$0.99
  • Remove ads$1.99
2 purchases

CONVERT UNITS

Subscriptions1
  • Remove ads$0.991 Month
One-time1
  • Remove ads$19.99

Questions

Is Units Converter for Engineers free?
Units Converter for Engineers is free to download, with in-app purchases available.
Is CONVERT UNITS free?
CONVERT UNITS is free to download, with in-app purchases available.
Which has better reviews, Units Converter for Engineers or CONVERT UNITS?
CONVERT UNITS is rated higher. Units Converter for Engineers averages 3.0 out of 5 from 2 ratings, while CONVERT UNITS averages 4.7 from 1.4K ratings.
Do Units Converter for Engineers or CONVERT UNITS have ads?
CONVERT UNITS shows ads; Units Converter for Engineers does not.
Which is updated more often, Units Converter for Engineers or CONVERT UNITS?
Units Converter for Engineers ships an update every 5 weeks, and CONVERT UNITS every 9 days. Most recently, Units Converter for Engineers was updated on September 19, 2026 and CONVERT UNITS on October 26, 2026.

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