# Heat Exchanger Performance vs ROL Assistant

The clearest difference is price: ROL Assistant at Free against Heat Exchanger Performance's $4.99. ROL Assistant also leads on iOS requirement (11.4 vs 14.3). On update cadence, ads, in-app purchases and device support there is nothing between them.

ROL Assistant is free to download; Heat Exchanger Performance costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Heat Exchanger Performance ships an update every 6 months, ROL Assistant every 4 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | Heat Exchanger Performance | ROL Assistant |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/rol-assistant/id775678395/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 4 months** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 28 MB |
| Requires iOS | 14.3 | **11.4** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kaup Shenoy Associates](https://appshunter.io/developer/460148822) | [Astron International, Inc.](https://appshunter.io/developer/775678398) |

## What reviewers say

### Heat Exchanger Performance

[App page](https://appshunter.io/ios/app/heat-exchanger-performance/id499929799)

Evaluate shell and tube heat exchanger performance, including overall heat transfer U-coefficient and maintenance needs based on performance changes. Save and reload multiple heat exchanger data sets for continuous monitoring.

**Highlights:** Evaluate overall heat transfer U-coefficient, Determine maintenance requirements, Save and reload multiple heat exchanger data, Select common industrial fluids, Create custom fluid properties, Edit data in SI and USCS units, Compute heat transfer area

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Heat Exchanger Performance free?

Heat Exchanger Performance costs $4.99, with no in-app purchases.

### Is ROL Assistant free?

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

### Do Heat Exchanger Performance or ROL Assistant have ads?

Neither Heat Exchanger Performance nor ROL Assistant shows ads.

### Which is updated more often, Heat Exchanger Performance or ROL Assistant?

Heat Exchanger Performance ships an update every 6 months, and ROL Assistant every 4 months. Most recently, Heat Exchanger Performance was updated on November 1, 2026 and ROL Assistant on November 1, 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.*