Comparison

Converter vs Conversion Calculator

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

This utility app offers a comprehensive unit conversion tool for various needs, including cooking, travel, and work. It supports over 120 units across 15 categories, with metric and imperial options. The app works offline and allows for customization of displayed decimals and category order.

Highlights
  • 15 categories and 120+ units
  • Metric and imperial conversions
  • Cooking, weight, length, temperature, and more
  • Offline functionality
  • Customizable decimal display
  • Apple Watch app
Features
Read full description

Convert cooking measurements, kg to lbs, feet to meters, Celsius to Fahrenheit and psi to bar in a tap. Conversion Calculator is a fast, clean unit converter for the kitchen, travel, the gym, school and work. COOKING & KITCHEN • Cups, tablespoons, teaspoons, fluid ounces, pints, quarts and gallons • US and imperial (UK) cups, pints and gallons kept separate, so recipes come out right • Grams, ounces and pounds for baking WEIGHT & BODY • kg to lbs, stones, ounces, grams and milligrams LENGTH, AREA & LAND • Feet, inches, meters, cm, miles, km, yards and nautical miles • Square feet, square meters, acres and hectares TEMPERATURE, SPEED & MORE • Celsius, Fahrenheit and Kelvin • km/h, mph, knots and m/s • Energy: calories, kcal, joules and kWh • Data: bytes, KB, MB, GB and TB • Time: seconds to hours PRESSURE, FUEL, POWER & MORE • Pressure: psi, bar, kPa, atm, mmHg and inHg • Fuel economy: mpg (US and UK), L/100 km and km/L • Power: horsepower (hp), kW and watts • Torque: N·m, lbf·ft and kgf·m • Force: newtons, lbf and kgf • Angle: degrees, radians and gradians MADE FOR EVERYDAY USE • 15 categories and 120+ units, metric and imperial • Swap units in one tap and copy the result • Reorder categories so the ones you use are on top, or hide the rest with Pro • Choose how many decimals to show • Apple Watch app for conversions on your wrist • Works offline Converting is free. Pro is an optional one-time purchase.

Screenshots

Converter4 screens
Conversion Calculator4 screens

Verdict

The call

The clearest difference is in-app purchases: Converter at none against Conversion Calculator's 1. Converter also leads on ratings volume (981 vs 165) and iOS requirement (15.6 vs 17.0). 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. Conversion Calculator 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 4.8 for Conversion Calculator. That said, the two scores are not equally well evidenced: Converter has 981 ratings behind it against 165, 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 100% of Conversion Calculator's.

UpkeepUpdate frequency

Converter ships an update every 2 months, Conversion Calculator every 5 weeks. The most recent releases landed on November 6, 2026 and November 8, 2026 respectively.

Scorecard4 real differences · 6 level
Converter versus Conversion Calculator: the parameters behind the verdict, then further details
ParameterConverterConversion Calculator
PriceFreeFree
Rating4.9 (981 ratings) — better4.8 (165 ratings)
Positive reviews93.9% of reviews100.0% of reviews — better
Number of ratings981 — better165
Update frequencyEvery 2 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS15.6 — better17.0
Further details — not scored
Size37 MB10 MB
Age rating12+4+
DeveloperTrelleborg Sealing SolutionsCollins Cheruiyot

Customer experience

Converter

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

Conversion Calculator

All ratings165 ratings
Positive95.8%
Neutral3.0%
Negative1.2%
Written reviews6 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

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

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Converter

No in-app purchases

1 purchases

Conversion Calculator

One-time1
  • Unlimited access forever$8.99

Questions

Is Converter free?
Converter is free to download, with no in-app purchases.
Is Conversion Calculator free?
Conversion Calculator is free to download, with in-app purchases available.
Which has better reviews, Converter or Conversion Calculator?
Converter is rated higher. Converter averages 4.9 out of 5 from 981 ratings, while Conversion Calculator averages 4.8 from 165 ratings.
Do Converter or Conversion Calculator have ads?
Neither Converter nor Conversion Calculator shows ads.
Which is updated more often, Converter or Conversion Calculator?
Converter ships an update every 2 months, and Conversion Calculator every 5 weeks. Most recently, Converter was updated on November 6, 2026 and Conversion Calculator on November 8, 2026.

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