Converter vs Roll Length Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
Roll Length Calc
Calculate the length and area of rolled materials with precision. Save, search, and manage your calculations with detailed reports and notes. Supports multiple units and offers a user-friendly interface for professionals.
- Calculate roll length from diameters and thickness
- Compute material surface area
- Save calculations with custom titles and types
- Add notes to reports
- Search through saved reports
- Calculate roll diameter from length
- Support for multiple units of measurement
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Roll Length Calc - Accurate Material Calculations Professional app for calculating rolled material length, area and creating detailed reports. MAIN FEATURES: Calculate roll length based on diameters and material thickness Compute material surface area Save calculations with custom titles and material types Add notes to each report Complete list of all saved calculations Search through reports and materials New Feature: Now you can calculate the roll diameter based on the length and material parameters! Just switch modes and get the result instantly. Thanks to your feedback, we keep improving the app. If you find it useful, please leave a review on the App Store – it helps us a lot! Support for multiple units of measurement (mm, cm, m, inches) CREATE COMPREHENSIVE REPORTS: Specify material type (film, fabric, paper, metal) Add detailed notes and comments Maintain complete calculation history Organize and manage your data efficiently PERFECT FOR: Manufacturing companies and factories Construction and engineering firms Logistics and supply chain services Warehouse and inventory management Engineers and technicians Technical students and educators CALCULATION CAPABILITIES: Roll length of various materials Surface area calculations Winding density coefficient Precise mathematical formulas TECHNICAL SPECIFICATIONS: Simple and intuitive user interface Fast and accurate computations Secure data storage and backup Support for metric and imperial systems Optimize your production processes with our advanced calculator. Calculate roll length, generate comprehensive reports, and manage your materials efficiently. Essential tool for professionals working with rolled materials in manufacturing, construction, and logistics industries.
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Verdict
The clearest difference is price: Converter at Free against Roll Length Calc's $0.99. On review sentiment, update cadence, ads and in-app purchases 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
Converter is free to download; Roll Length Calc costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 20, 2026 and September 7, 2026 respectively.
| Parameter | Converter | Roll Length Calc |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.9 (980 ratings) — better | — |
| Positive reviews | 93.9% of reviews | 100.0% of reviews — better |
| Number of ratings | 980 — better | — |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 37 MB | 2 MB |
| Age rating | 12+ | 17+ |
| Developer | Trelleborg Sealing Solutions | Konstantin Khoroshun |
Customer experience
Converter
Roll Length Calc
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
Roll Length Calc
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Converter
No in-app purchases
Roll Length Calc
No in-app purchases
Questions
Is Converter free?
Is Roll Length Calc free?
Do Converter or Roll Length Calc have ads?
Which is updated more often, Converter or Roll Length Calc?
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