Comparison

Converter vs Conversion Calculator Units

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

Conversion Calculator Units

This app offers a simple and powerful way to convert between over 140 units across 12 categories. Easily switch between units, customize your experience with themes, and share your results.

Highlights
  • Converts over 140 units
  • Supports 12 conversion categories
  • Customizable themes
  • Drag and set unit positions
  • Add units to favorites
  • Share converted units via email
Features
Read full description

* Handy Conversion Calculator App For 12 Categories & 140+ Units * Simple, Powerful & Conversion Calculator app designed for iPhone and iPad! Just tap and convert any units with its clean interface and user-friendly navigation. Simple swipe actions will allow you to convert quickly and change conversion options easily for additional convenience. Download the fastest & easiest to use converter app today! Conversions from one unit to another unit no longer have to be confusing, simply use Best Unit Converter today. * Features: - Ability To Change Themes - Drag & Set Position Of Units - Add Units To Favorites Section - Restore Category Listing - Enable/Disable Units - Set Decimal Digit Count - Share Converted Units by Email ** Conversion (12 Categories & 140+ Units): - Area  - Length - Energy - Volume - Weight - Power  - Speed  - Time - Number - Temperature  - Data Storage - Fuel Consumption Conversion Calculator is a beautifully designed universal app, designed for both iPhone & iPad. Get the best easy to use metric and units converter for length, number, power, speed, temperature, time, weight, area, energy, and other popular measurement converters tool. Download free. ************************************************************* * Download Conversion Calculator Today! * * Be Sure To Checkout Other Popular Utilities & Games From RV AppStudios! * *************************************************************

Screenshots

Converter4 screens
Conversion Calculator Units4 screens

Verdict

The call

The clearest difference is in-app purchases: Converter at none against Conversion Calculator Units's 1. Converter also leads on ads (none vs shown) and review sentiment (94% vs 82%). Conversion Calculator Units's advantage is ratings volume (5K vs 981). On price, rating, update cadence 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. Conversion Calculator Units sells 1 one-off in-app purchase. Converter asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Converter against 4.7 for Conversion Calculator Units. That said, the two scores are not equally well evidenced: Conversion Calculator Units has 5K ratings behind it against 981, 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 82% of Conversion Calculator Units's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 25, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 5 level
Converter versus Conversion Calculator Units: the parameters behind the verdict, then further details
ParameterConverterConversion Calculator Units
PriceFreeFree
Rating4.9 (981 ratings) — better4.7 (5K ratings)
Positive reviews93.9% of reviews — better82.1% of reviews
Number of ratings9815K — better
Update frequencyEvery 2 monthsEvery 2 months
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size37 MB41 MB
Age rating12+4+
DeveloperTrelleborg Sealing SolutionsRV AppStudios LLC

Customer experience

Converter

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

Conversion Calculator Units

All ratings4,970 ratings
Positive95.7%
Neutral2.5%
Negative1.8%
Written reviews117 reviews
Positive82.1%
Neutral5.1%
Negative12.8%

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

Conversion Calculator Units

From 5K App Store ratings

What we love

  • 👍 User-friendly
  • 🚀 Easy to use
  • 💡 Helpful for learning metric system
  • 👍 Great for conversions
  • 👍 Intuitive interface

Room to improve

  • 🐛 Ads disrupt usage
  • 🐛 Difficult to change units
  • 🐛 Lacks portrait mode
  • 🐛 Upside-down orientation issues
  • 🐛 Cluttered UI design

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

Conversion Calculator Units

Reported bugs

2 issues
  • Ads not removed after purchase
  • Incorrect unit conversions

Requested features

4 requests
  • Add pressure conversion units
  • Include a basic calculator function
  • Implement multi-language support
  • Allow customization of unit order

In-app purchases

None

Converter

No in-app purchases

1 purchases

Conversion Calculator Units

One-time1
  • Remove Ads$1.99

Questions

Is Converter free?
Converter is free to download, with no in-app purchases.
Is Conversion Calculator Units free?
Conversion Calculator Units is free to download, with in-app purchases available.
Which has better reviews, Converter or Conversion Calculator Units?
Converter is rated higher. Converter averages 4.9 out of 5 from 981 ratings, while Conversion Calculator Units averages 4.7 from 5K ratings.
Do Converter or Conversion Calculator Units have ads?
Conversion Calculator Units shows ads; Converter does not.
Which is updated more often, Converter or Conversion Calculator Units?
Converter ships an update every 2 months, and Conversion Calculator Units every 2 months. Most recently, Converter was updated on October 25, 2026 and Conversion Calculator Units on November 3, 2026.

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