Comparison

Converter vs OtoBLE

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

OtoBLE

Features
Read full description

To ensure that internally placed hearing protectors (otoplastics) function optimally, a leak test is performed. This highly reproducible test (measurement) provides certainty about the exact fit of the otoplastic.

Screenshots

Converter4 screens
OtoBLE3 screens

Verdict

The call

The clearest difference is update cadence: Converter at every 2 months against OtoBLE's every 14 months. OtoBLE's advantage is iOS requirement (12.4 vs 15.6). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Converter ships an update every 2 months, OtoBLE every 14 months. The most recent releases landed on October 14, 2026 and September 28, 2026 respectively.

Scorecard2 real differences · 8 level
Converter versus OtoBLE: the parameters behind the verdict, then further details
ParameterConverterOtoBLE
PriceFreeFree
Rating4.9 (897 ratings) — better—
Positive reviews93.9% of reviews—
Number of ratings897 — better—
Update frequencyEvery 2 months — betterEvery 14 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.612.4 — better
Further details — not scored
Size37 MB30 MB
Age rating12+17+
DeveloperTrelleborg Sealing SolutionsFrank Zwarthoed

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

OtoBLE

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Converter

No in-app purchases

None

OtoBLE

No in-app purchases

Questions

Is Converter free?
Converter is free to download, with no in-app purchases.
Is OtoBLE free?
OtoBLE is free to download, with no in-app purchases.
Do Converter or OtoBLE have ads?
Neither Converter nor OtoBLE shows ads.
Which is updated more often, Converter or OtoBLE?
Converter ships an update every 2 months, and OtoBLE every 14 months. Most recently, Converter was updated on October 14, 2026 and OtoBLE on September 28, 2026.

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