# ROL Assistant vs Rheosoft OBD2

The clearest difference is iOS requirement: ROL Assistant at 11.4 against Rheosoft OBD2's 26.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | ROL Assistant | Rheosoft OBD2 |
| --- | --- | --- |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 4 months | — |
| Monetization | Free | — |
| Size | 28 MB | 3 MB |
| Requires iOS | **11.4** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Astron International, Inc.](https://appshunter.io/developer/775678398) | [James Mittler II](https://appshunter.io/developer/1840960038) |

## 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


### Rheosoft OBD2

[App page](https://appshunter.io/ios/app/rheosoft-obd2/id6754894819)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ROL Assistant free?

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

### Is Rheosoft OBD2 free?

Rheosoft OBD2 is free to download, with no in-app purchases.

### Do ROL Assistant or Rheosoft OBD2 have ads?

Neither ROL Assistant nor Rheosoft OBD2 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.*