# ROL Assistant vs CORE Calculator App

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.

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.

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.

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.

## The numbers

| Metric | ROL Assistant | CORE Calculator App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/rol-assistant/id775678395/reviews) | [5.0 (11 ratings)](https://appshunter.io/ios/app/core-calculator-app/id1447118499/reviews) |
| Number of ratings | 2 | **11** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 28 MB | 148 MB |
| Requires iOS | **11.4** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Astron International, Inc.](https://appshunter.io/developer/775678398) | [AsInt Inc.](https://appshunter.io/developer/1438397626) |

## What reviewers say

### ROL Assistant

[App page](https://appshunter.io/ios/app/rol-assistant/id775678395)

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:** macOS Compatibility

**In-app purchases:** none


### CORE Calculator App

[App page](https://appshunter.io/ios/app/core-calculator-app/id1447118499)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Materials Lookup | $4.99 | per month |
| Damage Mech Screener | $9.99 | per month |
| Materials Lookup | $5.99 | one-time |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*