# ROL Assistant vs StressTable2021

The clearest difference is in-app purchases: ROL Assistant at none against StressTable2021'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. StressTable2021 sells 1 one-off in-app purchase. ROL Assistant asks for nothing beyond the download.

## The numbers

| Metric | ROL Assistant | StressTable2021 |
| --- | --- | --- |
| 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 | 20 MB |
| Requires iOS | **11.4** | 13.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 17+ |
| Developer | [Astron International, Inc.](https://appshunter.io/developer/775678398) | [Shabbir Ahmed](https://appshunter.io/developer/1083166021) |

## 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


### StressTable2021

[App page](https://appshunter.io/ios/app/stresstable2021/id6461216630)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Non-Consumable Subscription | $9.99 | one-time |


## Frequently asked questions

### Is ROL Assistant free?

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

### Is StressTable2021 free?

StressTable2021 is free to download, with in-app purchases available.

### Do ROL Assistant or StressTable2021 have ads?

Neither ROL Assistant nor StressTable2021 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.*