Comparison

Unit Converter vs Convertible

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

Convertible

This app offers a comprehensive unit and currency conversion tool with a visually appealing interface and extensive unit options. It supports standard and non-standard units, compound conversions, and fraction input, making it versatile for various needs.

Highlights
  • Extensive standard and non-standard unit conversions
  • Currency conversion with 161 currencies
  • Compound unit conversion
  • Fraction input and output
  • Adjustable decimal precision
  • Elegant interface with themes
  • iPad split view and Today Extension support
Features
Read full description

Features: • iPad split view and slide over mode for compatible devices (iOS 9+ only) • Today Extension, view your most recent conversion (great for Currency updates) • Elegant interface with 19 beautiful themes • Full range of standard units for both metric (SI) and non-metric conversions • Hundreds of non-standard units categorised for quick access: Geography, Nature, Everyday Objects, Sports, etc. • Compound unit conversion on many units including time (e.g. hours, minutes, seconds), length, area, etc. • Fraction input and output on some units (e.g. inches) • URL Scheme support, automate conversions with apps such as Launch Center Pro. • Adjustable decimal precision from 5 to 15 significant figures. • A huge range of standard and non standard units from planck lengths to the size of the visible universe. • Share conversions via Twitter, Facebook, email and messaging. Convertible helps to visualise unit conversions in ways not possible with other unit converters: compare distance in miles to the length of the Amazon River, area in square yards to the size of a football field, the possibilities are endless. More conversion types are being added with each release, currently Convertible can convert: • Length • Mass/Weight • Area • 161 Currencies including Bitcoin • Energy • Power • Torque • Volume • Flow • Pressure • Force • Fuel Economy • Temperature • Data • Time • Speed Unit conversion is also entertaining and educational thanks to the many non-standard units of measure available. “Stands out from many other apps of its type.” - The New York Times "Convertible is one of the most peculiar and fun iPhone apps I’ve downloaded recently." - MacStories.net "With customizable themes, amazing readability and an intuitive and easy to use interface, Convertible is definitely in a class of its own." - 4.5 stars, 148apps.com

Screenshots

Unit Converter4 screens
Convertible4 screens

Verdict

The call

The clearest difference is in-app purchases: Convertible at none against Unit Converter's 3. Convertible also leads on ads (none vs shown) and iOS requirement (8.0 vs 17.6). Unit Converter's advantage is update cadence (weekly vs every 2 months) and ratings volume (1.5K vs 101). On price, rating, review sentiment 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Unit Converter sells 3 in-app purchases, starting at $0.99 per month. Convertible asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Unit Converter against 4.8 for Convertible. That said, the two scores are not equally well evidenced: Unit Converter has 1.5K ratings behind it against 101, so its average is the more settled of the two. Written reviews are what separate them: 88% of Unit Converter's written reviews are positive against 89% of Convertible's.

UpkeepUpdate frequency

Unit Converter ships an update weekly, Convertible every 2 months. The most recent releases landed on November 10, 2026 and November 1, 2026 respectively.

Scorecard6 real differences · 4 level
Unit Converter versus Convertible: the parameters behind the verdict, then further details
ParameterUnit ConverterConvertible
PriceFreeFree
Rating4.8 (1.5K ratings)4.8 (101 ratings) — better
Positive reviews87.7% of reviews89.2% of reviews — better
Number of ratings1.5K — better101
Update frequencyWeekly — betterEvery 2 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.68.0 — better
Further details — not scored
Size13 MB12 MB
Age rating4+4+
DeveloperScott DeSapioEfecto Pty Ltd

Customer experience

Unit Converter

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

Convertible

All ratings97 ratings
Positive94.8%
Neutral2.1%
Negative3.1%
Written reviews203 reviews
Positive89.2%
Neutral2.5%
Negative8.4%

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

Convertible

From 101 App Store ratings

What we love

  • 💻 Excellent user interface
  • ⚙️ Comprehensive set of conversion units
  • 🔍 Intuitive and easy to use
  • 🎨 Customizable color themes
  • 🕰️ Saves last conversion

Room to improve

  • 🐛 Occasional crashes or bugs
  • 🔍 Navigation can be confusing at times
  • 🔢 Lack of support for custom units

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

Convertible

Reported bugs

2 issues
  • Conversion results not always accurate
  • Crashes when trying to share conversion results

Requested features

4 requests
  • Add support for more measurement categories (e.g. fuel consumption, flow rate)
  • Implement a search function to easily find units
  • Provide a widget for quick access to conversions
  • Add support for more languages

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
None

Convertible

No in-app purchases

Questions

Is Unit Converter free?
Unit Converter is free to download, with in-app purchases available.
Is Convertible free?
Convertible is free to download, with no in-app purchases.
Which has better reviews, Unit Converter or Convertible?
Convertible is rated higher. Unit Converter averages 4.8 out of 5 from 1.5K ratings, while Convertible averages 4.8 from 101 ratings.
Do Unit Converter or Convertible have ads?
Unit Converter shows ads; Convertible does not.
Which is updated more often, Unit Converter or Convertible?
Unit Converter ships an update weekly, and Convertible every 2 months. Most recently, Unit Converter was updated on November 10, 2026 and Convertible on November 1, 2026.

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