Unit Converter vs CONVERT UNITS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Unit Converter
This app offers a comprehensive unit conversion tool with over 300 units across 27 categories. It supports compound units, date calculations, and conversions between various number systems, including historical units. The interface is designed for ease of use with smart keyboards and customizable display options.
- 27 conversion categories
- 300+ units
- Compound unit support
- Date calculator
- Fractions and number conversions
- Historical units
- Customizable interface
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Convert everything - 31 categories, 300+ units! Mila's Tools Unit Converter puts 31 converters in your pocket at no cost. Whether you need to convert temperatures for a recipe, check tire pressure in PSI, find your ring size across international standards, or calculate the days until a deadline, this app handles it all with precision and ease. What customers are saying: ***** "Get it! Nothing better than this!" ***** "This is the best quick ref tool I have come across to date" ***** "Undoubtedly the best conversion app in the App Store." ***** "Best app for me so far." ***** "Intuitive interface. The app design is so easy you'll actually use it." 31 CONVERSION CATEGORIES Angle · Area · Bits & Bytes · Blood Sugar · Capacitance · Cooking · Current · Data Transfer Rates · Dates · Density · Energy · Flow Rate · Force · Fractions · Frequency · Fuel Economy · Gauges · Illuminance · Length · Numbers · Power · Pressure · Ring Sizes · Shoes · Slope · Speed · Temperature · Time · Torque · Volume · Weight COMPOUND UNITS Work with real-world measurements like feet + inches, pounds + ounces, or gallons + quarts. Values auto-normalize — type 13 inches and see 1 foot 1 inch instantly. DATE CALCULATOR Find the exact number of days, weeks, months, and years between any two dates. Add or subtract time from a date with quick-action shortcuts like "90 Days from Today" or "End of Year." DATE CONVERTER See any date across 10 calendar systems — Gregorian, Islamic, Hebrew, Chinese, Persian, Indian National, Coptic, Ethiopic, Buddhist, and Japanese — plus Unix timestamps, Julian Day numbers, and ISO 8601 week dates. Tap the info icon for details on each calendar system. FRACTIONS & NUMBERS Convert between fractions, decimals, and percentages. Translate numbers into Roman numerals, binary, octal, and hexadecimal. Explore magnitudes from thousands to decillions. RING SIZES Convert between US, EU, Swiss, Japanese, Chinese (Mainland), and Hong Kong ring sizing standards. View inner diameter and circumference in millimeters for precise measurements. HISTORICAL UNITS Go beyond modern measurements with ancient Egyptian, Mesopotamian, Greek, Roman, and Biblical units of length. BUILT FOR PRECISION Choose automatic smart formatting or set manual decimal precision from 0 to 10 places. Locale-aware number formatting respects your region's separators and conventions. SMART CUSTOM KEYBOARDS Purpose-built keyboards for every input type — numeric, whole number, Roman numeral, binary, octal, and hexadecimal — so you never have to fight autocorrect. DESIGNED FOR YOU • Dark mode with rich, category-specific color themes • Comfortable or compact view styles • Show or hide any unit in any category • Available on iPhone, iPad, and Mac Download now and experience the most comprehensive unit conversion app available! - - - - - Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
CONVERT UNITS
This app offers extensive unit and currency conversion capabilities, including offline access for saved rates. It features a user-friendly interface with customizable options and supports a wide range of categories for everyday and specialized needs.
- Offline conversion for saved rates
- 160 currencies and 126 cryptocurrencies
- 685 units across 72 categories
- Customizable themes (Premium)
- Split View support for iPad
- Dark and light appearance support
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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
Unit Converter and CONVERT UNITS both sit at 4.8 stars, but that hides the real split: 88% of Unit Converter's written reviews are positive against 76% of CONVERT UNITS's. CONVERT UNITS's advantage is iOS requirement (15.0 vs 17.6). On price, rating, ratings volume and update cadence 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. Unit Converter sells 3 in-app purchases, starting at $0.99 per month 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.
On the App Store both sit at effectively the same score — 4.8 for Unit Converter against 4.7 for CONVERT UNITS. Both are backed by a comparable volume of ratings — 1.5K and 1.4K respectively. Written reviews are what separate them: 88% of Unit Converter's written reviews are positive against 76% of CONVERT UNITS's.
Both ship on a similar rhythm, roughly weekly. The most recent releases landed on November 13, 2026 and November 11, 2026 respectively.
| Parameter | Unit Converter | CONVERT UNITS |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (1.5K ratings) — better | 4.7 (1.4K ratings) |
| Positive reviews | 87.7% of reviews — better | 75.8% of reviews |
| Number of ratings | 1.5K — better | 1.4K |
| Update frequency | Weekly | Weekly |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 13 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Scott DeSapio | Adysseus |
Customer experience
Unit Converter
CONVERT UNITS
User reviews
Unit Converter
From 1.5K App Store ratingsWhat we love
- 👍 Easy to use
- 🚀 Quick and accurate conversions
- 💡 Comprehensive list of units
- 🔍 Convenient for everyday use
- ⭐ Reliable and consistent
Room to improve
- 🐛 Scrolling issues on newer devices
- 🔍 Limited customization options
- 💰 Desire for free version to remain free
CONVERT UNITS
From 1.4K App Store ratingsWhat we love
- 👍 Quick & easy to use
- 👍 Ease of use
- 👍 Simple and easy to use
- 👍 Well thought out and easy to use
- 👍 Excellent and very reliable
Room to improve
- 🐛 Ads obstruct use
- 🐛 Subscription required to remove ads
- 🐛 Currency conversion not working
Bugs and requests
Unit Converter
Reported bugs
2 issues- Crashes or freezes on some devices
- Conversion results not displaying properly
Requested features
3 requests- Ability to customize order of conversion units
- Addition of more specialized units (e.g. astronomical distances)
- Improved scrolling functionality on all devices
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
Unit Converter
- Mila's Tools PRO Monthly$0.991 Month
- Mila's Tools PRO Yearly$4.991 Year
- Mila's Tools PRO Lifetime$9.99
CONVERT UNITS
- Remove ads$0.991 Month
- Remove ads$19.99





