Comparison

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

Converter

This app offers a comprehensive unit and hardness conversion tool with an easy-to-use interface. It includes currency conversion with updated exchange rates, over 300 engineering and scientific units, and a specialized hardness converter. Additional features like timezone conversion, pace calculation, and a standard calculator enhance its utility.

Highlights
  • Currency converter with live exchange rates
  • Over 300 engineering and scientific units
  • Specialized hardness converter
  • Timezone conversion
  • Running pace calculator
  • Integrated standard calculator
  • Conversion history log
Features
Read full description

Trelleborg’s “Unit and Hardness Converter” converts a comprehensive list of units (incl. currencies) in an easy way. In addition, the app has a set of other useful features on board, like timezone conversion, percentage calculations, a running pace calculator and more What our users say: “Have been using it forever, never tried other converter as this one does the job perfectly” - Lazareth_fr “Fabulous resource, but also a functional masterpiece!” -Otto. “This is needed by all engineers. So simple and easy to use” -JLa03.   FEATURES • Easy-to-use interface • Currency converter with in-app exchange rate update functionality • Over 300 engineering and scientific conversion units in 32 categories • Hardness converter with 16 conversion tables based on ASTM E140-07 and ISO-18265 for quick conversion between different scales • Video library: features the extensive Trelleborg Sealing Solutions YouTube library • Toggle between units • Switch between dark and white theme • Conversion history log • Create favorite lists • Standard calculator integrated with unit converter DIMENSIONS • Area • Currency • Current • Data • Density • Distance • Dynamic Viscosity • Energy • Force • Frequency • Kinematic Viscosity • Moment of inertia • Power • Prefixes • Pressure • Speed • Strength • Temperature • Time • Torque • Volume • Weight • Fuel Consumption • Glucose • Vacuum • Numbers • Illumination • Radioactivity • Radiation (absorbed) • Angles • Volume Flow Rate • Calorie • Metric Prefixes • Typography • Electric Charge OTHER MISCELLANEOUS CATEGORIES • Timezone conversion • Clothing sizes / Shoe sizes • International power plugs • Running pace calculator • Percentage calculator • Pace • Hex, Binary, Decimal • BMI (metric/inch) HARDNESS SCALES INCLUDED • Rockwell (HRC, HRA, HRD, HRF, HRG, HRE, HR-15-N, HR-30N, HR-45-N, HR45-T, HR-15T, HR-30T, HR45-T) • Brinell (HBW, HBS) • Vickers (HV, • Knoop (HK) The app is available in English, German and Chinese languages. Download now or contact us with any questions.

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

Converter4 screens
Convertible4 screens

Verdict

The call

The clearest difference is monetization model: Converter at free against Convertible's paid. Converter also leads on ratings volume (981 vs 101). Convertible's advantage is iOS requirement (8.0 vs 15.6). On price, rating, review sentiment 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Converter against 4.8 for Convertible. That said, the two scores are not equally well evidenced: Converter has 981 ratings behind it against 101, so its average is the more settled of the two. Written reviews are what separate them: 94% of Converter's written reviews are positive against 89% of Convertible's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 6, 2026 and November 1, 2026 respectively.

Scorecard3 real differences · 7 level
Converter versus Convertible: the parameters behind the verdict, then further details
ParameterConverterConvertible
PriceFreeFree
Rating4.9 (981 ratings) — better4.8 (101 ratings)
Positive reviews93.9% of reviews — better89.2% of reviews
Number of ratings981 — better101
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.68.0 — better
Further details — not scored
Size37 MB12 MB
Age rating12+4+
DeveloperTrelleborg Sealing SolutionsEfecto Pty Ltd

Customer experience

Converter

All ratings897 ratings
Positive98.1%
Neutral1.3%
Negative0.6%
Written reviews608 reviews
Positive93.9%
Neutral3.3%
Negative2.8%

Convertible

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

User reviews

Converter

From 981 App Store ratings

What we love

  • 👍 Easy to use
  • 🚀 Accurate and fast conversions
  • 💡 Comprehensive coverage of units and categories
  • 🔒 No ads or hidden fees
  • 💡 Useful currency converter

Room to improve

  • 🐛 Currency conversion rates can be outdated
  • 🔍 Difficult to find specific conversions due to large number of options
  • 💡 Lack of ability to set favorite conversions as default

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

Converter

Reported bugs

2 issues
  • Occasional crashes on startup for non-English/German users
  • Conversion from meters to feet does not show inches

Requested features

3 requests
  • Add fuel efficiency conversions
  • Allow users to set favorite conversions as default
  • Improve currency conversion rate updates

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

None

Converter

No in-app purchases

None

Convertible

No in-app purchases

Questions

Is Converter free?
Converter is free to download, with no in-app purchases.
Is Convertible free?
Convertible is free to download, with no in-app purchases.
Which has better reviews, Converter or Convertible?
Converter is rated higher. Converter averages 4.9 out of 5 from 981 ratings, while Convertible averages 4.8 from 101 ratings.
Do Converter or Convertible have ads?
Neither Converter nor Convertible shows ads.
Which is updated more often, Converter or Convertible?
Converter ships an update every 2 months, and Convertible every 2 months. Most recently, Converter was updated on November 6, 2026 and Convertible on November 1, 2026.

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