ROL Assistant vs LMF CompXpert
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ROL Assistant
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.
- Virtual refining advisor
- Extensive unit conversions
- Steam properties calculator
- Line pressure drop calculation
- English and Metric units
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ROL Sia: Sia virtual advisor on Refining Online®. Ask Sia your refining question for answers from the Refining Online Q&A. Unit Conversion: Length, Area, Volume, Mass, Density, Pressure, Energy, Power, Temperature, Flowrate, Viscosity, Specific Energy, Heat Flux, Heat Transfer Coefficient, Thermal Conductivity... Steam Properties: Enthalpy, Density, Heat Capacity, Viscosity, Thermal Conductivity of saturated steam, water, and superheated steam. Line Pressure Drop: Single phase line pressure drop calculation for different pipe sizes and materials in English or Metric units.
LMF CompXpert
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LMF CompXpert is a mobile calculation and selection tool for industrial compressor solutions that simplifies engineering workflows. With just a few input parameters, the app enables quick and reliable estimation of key process values in the earliest project stages. Based on these results, suitable compressor models can be efficiently pre-selected and inquiries can be generated directly.
Screenshots
Verdict
The clearest difference is update cadence: ROL Assistant at every 4 months against LMF CompXpert's every 12 months. ROL Assistant also leads on iOS requirement (11.4 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
ROL Assistant ships an update every 4 months, LMF CompXpert every 12 months. The most recent releases landed on September 27, 2026 and October 10, 2026 respectively.
| Parameter | ROL Assistant | LMF CompXpert |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 4 months — better | Every 12 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.4 — better | 13.0 |
| Further details — not scored | ||
| Size | 28 MB | 154 MB |
| Age rating | 4+ | 4+ |
| Developer | Astron International, Inc. | Leobersdorfer Maschinenfabrik GmbH |
In-app purchases
ROL Assistant
No in-app purchases
LMF CompXpert
No in-app purchases
Questions
Is ROL Assistant free?
Is LMF CompXpert free?
Do ROL Assistant or LMF CompXpert have ads?
Which is updated more often, ROL Assistant or LMF CompXpert?
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