Comparison

Unit Converter vs Unit Converter HD.

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

Head to head
About

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.

Highlights
  • 27 conversion categories
  • 300+ units
  • Compound unit support
  • Date calculator
  • Fractions and number conversions
  • Historical units
  • Customizable interface
Features
Read full description

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/

About

Unit Converter HD.

Easily convert over 700 units across 30 categories with this powerful tool. It offers a user-friendly interface, dark mode support, and a backspace key for quick corrections. Save time on all your measurement conversion needs.

Highlights
  • 700+ Units of Measure
  • 30 Conversion Categories
  • Easy-to-Use Interface
  • Dark Mode Support
  • Backspace Key
Features
Read full description

The most powerful unit converter in the market. Helps you make easy conversion between more than 700+ various units of measure in 30 categories. Discover a universal assistant for all of your unit conversion needs. Features: √ 30 Categories √ 700+ Units of Measure √ Backspace key √ Extremely Easy-to-Use √ Supports Dark Mode Save Your Time. Quickly & Easily! Universer Unit Converter Free HD URL scheme is "EWUnitConverterFree://"

Screenshots

Unit Converter4 screens
Unit Converter HD.3 screens

Verdict

The call

The clearest difference is update cadence: Unit Converter at weekly against Unit Converter HD.'s every 2 months. Unit Converter HD.'s advantage is iOS requirement (13.0 vs 17.6). On price, rating, review sentiment and ratings volume 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. Unit Converter sells 3 in-app purchases, starting at $0.99 per month and Unit Converter HD. sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Unit Converter against 4.7 for Unit Converter HD.. Both are backed by a comparable volume of ratings — 1.5K and 645 respectively. Written reviews are what separate them: 88% of Unit Converter's written reviews are positive against 94% of Unit Converter HD.'s.

UpkeepUpdate frequency

Unit Converter ships an update weekly, Unit Converter HD. every 2 months. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.

Scorecard2 real differences · 8 level
Unit Converter versus Unit Converter HD.: the parameters behind the verdict, then further details
ParameterUnit ConverterUnit Converter HD.
PriceFreeFree
Rating4.8 (1.5K ratings) — better4.7 (645 ratings)
Positive reviews87.7% of reviews93.8% of reviews — better
Number of ratings1.5K — better645
Update frequencyWeekly — betterEvery 2 months
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.613.0 — better
Further details — not scored
Size13 MB86 MB
Age rating4+4+
DeveloperScott DeSapio良峰 侯

Customer experience

Unit Converter

All ratings1,485 ratings
Positive95.2%
Neutral1.0%
Negative3.8%
Written reviews365 reviews
Positive87.7%
Neutral3.0%
Negative9.3%

Unit Converter HD.

All ratings644 ratings
Positive94.7%
Neutral2.2%
Negative3.1%
Written reviews146 reviews
Positive93.8%
Neutral2.7%
Negative3.4%

User reviews

Unit Converter

From 1.5K App Store ratings

What 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

Unit Converter HD.

From 645 App Store ratings

What we love

  • 👍 Easy to use
  • 🚀 Handy and convenient
  • 💡 Comprehensive set of conversions
  • 🚀 Very useful app
  • 👍 Intuitive design

Room to improve

  • 🐛 Occasional crashes or freezing issues
  • 💡 Could be more intuitive for some users
  • 🔒 Requires horizontal orientation

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

Unit Converter HD.

Reported bugs

2 issues
  • Freezing or crashing on some devices
  • Display issues with certain units

Requested features

3 requests
  • Add support for US weights (tons, lbs., oz.)
  • Implement portrait mode support
  • Provide more customization options

In-app purchases

3 purchases

Unit Converter

Subscriptions2
  • Mila's Tools PRO Monthly$0.991 Month
  • Mila's Tools PRO Yearly$4.991 Year
One-time1
  • Mila's Tools PRO Lifetime$9.99
1 purchases

Unit Converter HD.

One-time1
  • Remove Ads Pack$1.99

Questions

Is Unit Converter free?
Unit Converter is free to download, with in-app purchases available.
Is Unit Converter HD. free?
Unit Converter HD. is free to download, with in-app purchases available.
Which has better reviews, Unit Converter or Unit Converter HD.?
Unit Converter is rated higher. Unit Converter averages 4.8 out of 5 from 1.5K ratings, while Unit Converter HD. averages 4.7 from 645 ratings.
Do Unit Converter or Unit Converter HD. have ads?
Both Unit Converter and Unit Converter HD. show ads.
Which is updated more often, Unit Converter or Unit Converter HD.?
Unit Converter ships an update weekly, and Unit Converter HD. every 2 months. Most recently, Unit Converter was updated on November 1, 2026 and Unit Converter HD. on October 29, 2026.

Other comparisons