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.
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.
- 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
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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.
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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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
Verdict
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
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.
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.
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.
| Parameter | Units Converter for Engineers | CONVERT UNITS |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) | 4.7 (1.4K ratings) — better |
| Positive reviews | 50.0% of reviews | 75.8% of reviews — better |
| Number of ratings | 2 | 1.4K — better |
| Update frequency | Every 5 weeks | Every 9 days — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Lucy Enterprises | Adysseus |
Customer experience
Units Converter for Engineers
CONVERT UNITS
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
Units Converter for Engineers
- Unlock all features$0.99
- Remove ads$1.99
CONVERT UNITS
- Remove ads$0.991 Month
- Remove ads$19.99
Questions
Is Units Converter for Engineers free?
Is CONVERT UNITS free?
Which has better reviews, Units Converter for Engineers or CONVERT UNITS?
Do Units Converter for Engineers or CONVERT UNITS have ads?
Which is updated more often, Units Converter for Engineers or CONVERT UNITS?
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