Comparison

ROL Assistant vs CORE Calculator App

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ROL Assistant

This utility app provides a virtual advisor for refining questions and offers extensive unit conversion tools. It also calculates steam properties and line pressure drops for various pipe materials and sizes.

Highlights
  • Virtual refining advisor
  • Extensive unit conversions
  • Steam properties calculator
  • Line pressure drop calculation
  • English and Metric units
Features
Read full description

ROL Sia: Sia virtual advisor on Refining Online®. Ask Sia your refining question for answers from the Refining Online Q&A. Unit Conversion: Length, Area, Volume, Mass, Density, Pressure, Energy, Power, Temperature, Flowrate, Viscosity, Specific Energy, Heat Flux, Heat Transfer Coefficient, Thermal Conductivity... Steam Properties: Enthalpy, Density, Heat Capacity, Viscosity, Thermal Conductivity of saturated steam, water, and superheated steam. Line Pressure Drop: Single phase line pressure drop calculation for different pipe sizes and materials in English or Metric units.

About

CORE Calculator App

This app provides inspectors in the oil and gas industry with essential calculations for asset integrity. It offers tools for determining Tmin, MAWP, corrosion rates, and remaining life based on industry standards.

Highlights
  • Tmin calculations
  • MAWP calculations
  • Corrosion rate calculations
  • Remaining life determination
  • Construction material information
  • Damage mechanism identification
Features
Read full description

AsInt delivers asset integrity solutions globally within the Oil and Gas Upstream, Midstream, Downstream, and Petrochemical industries. With our CORE Calculator mobile app, you have quick and easy calculator to assist API 510/570 Inspectors in calculating Tmin, MAWP, Corrosion Rates, Remaining life, etc. We use industry recognized codes and standards as the basis of all our software solutions. The app is designed to take common inspection and engineering calculations and make them available and accessible on your mobile device. Here are a few things that you can do from this mobile app: - Access comprehensive and updated information on construction materials. - Perform precise calculations based on operating details. - Identify probable damage mechanisms. - Determine remaining life based on thickness data. - Calculate corrosion rates with precision. - Seamless assessment of damage susceptibilities. and much more. Get started NOW! This CORE Calculator app is provided by AsInt, Inc. "AS IS" and AsInt takes no responsibilities or warranties of any kind concerning the safety, suitability of the calculations for your purpose, accuracy of your data, inaccuracies of user's application, or any other misuse of this application. There are inherent dangers in the use of any software, and you are solely responsible for determining the compatibility of this application with your equipment. Ensure that the industry codes and standards used as the basis of this application are applicable in your jurisdiction. We are committed to protecting and respecting your privacy. This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you use our CORE Calculator mobile application. We may update our Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page. You are advised to review this Privacy Policy periodically for any changes. Changes to this Privacy Policy are effective when they are posted on this page. By using the CORE Calculator mobile application, you agree to our terms and conditions stating Acceptance of Terms, Use of the App, Prohibited Uses, Disclaimer of Warranties, etc. For more information on Privacy Policy : https://asint.online/privacy-policy and Terms of Use : https://asint.net/mobiletermandconditions/ Contact us : info@asint.net

Screenshots

ROL Assistant4 screens
CORE Calculator App4 screens

Verdict

The call

The clearest difference is in-app purchases: ROL Assistant at none against CORE Calculator App's 3. ROL Assistant also leads on iOS requirement (11.4 vs 14.0). CORE Calculator App's advantage is ratings volume (11 vs 2). On price, rating, update cadence and ads 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. CORE Calculator App sells 3 in-app purchases, starting at $4.99 per month. ROL Assistant asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for ROL Assistant against 5.0 for CORE Calculator App. That said, the two scores are not equally well evidenced: CORE Calculator App has 11 ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

ROL Assistant ships an update every 4 months, CORE Calculator App every 3 months. The most recent releases landed on October 13, 2026 and October 17, 2026 respectively.

Scorecard4 real differences · 6 level
ROL Assistant versus CORE Calculator App: the parameters behind the verdict, then further details
ParameterROL AssistantCORE Calculator App
PriceFreeFree
Rating5.0 (2 ratings)5.0 (11 ratings)
Positive reviews—100.0% of reviews
Number of ratings211 — better
Update frequencyEvery 4 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.4 — better14.0
Further details — not scored
Size28 MB148 MB
Age rating4+4+
DeveloperAstron International, Inc.AsInt Inc.

Customer experience

ROL Assistant

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

CORE Calculator App

All ratings11 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

ROL Assistant

No in-app purchases

3 purchases

CORE Calculator App

Subscriptions2
  • Materials Lookup$4.991 Month
  • Damage Mech Screener$9.991 Month
One-time1
  • Materials Lookup$5.99

Questions

Is ROL Assistant free?
ROL Assistant is free to download, with no in-app purchases.
Is CORE Calculator App free?
CORE Calculator App is free to download, with in-app purchases available.
Which has better reviews, ROL Assistant or CORE Calculator App?
ROL Assistant and CORE Calculator App are both rated 5.0 out of 5 on the App Store, from 2 and 11 ratings respectively.
Do ROL Assistant or CORE Calculator App have ads?
Neither ROL Assistant nor CORE Calculator App shows ads.
Which is updated more often, ROL Assistant or CORE Calculator App?
ROL Assistant ships an update every 4 months, and CORE Calculator App every 3 months. Most recently, ROL Assistant was updated on October 13, 2026 and CORE Calculator App on October 17, 2026.

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