# ROL Assistant vs Thermo Dynamics Calc

The clearest difference is in-app purchases: ROL Assistant at none against Thermo Dynamics Calc's 1. ROL Assistant also leads on iOS requirement (11.4 vs 13.0). On price, ads and device support there is nothing between them.

Both are free to download. Thermo Dynamics Calc sells 1 one-off in-app purchase. ROL Assistant asks for nothing beyond the download.

## The numbers

| Metric | ROL Assistant | Thermo Dynamics Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/rol-assistant/id775678395/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | — |
| Monetization | Free | — |
| Size | 28 MB | 41 MB |
| Requires iOS | **11.4** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Astron International, Inc.](https://appshunter.io/developer/775678398) | [Shraddhaben Parmar](https://appshunter.io/developer/1889769325) |

## 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


### Thermo Dynamics Calc

[App page](https://appshunter.io/ios/app/thermo-dynamics-calc/id6766844933)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime premium | $12.99 | one-time |


## Frequently asked questions

### Is ROL Assistant free?

ROL Assistant is free to download, with no in-app purchases.

### Is Thermo Dynamics Calc free?

Thermo Dynamics Calc is free to download, with in-app purchases available.

### Do ROL Assistant or Thermo Dynamics Calc have ads?

Neither ROL Assistant nor Thermo Dynamics Calc shows ads.

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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.*