# RMU2 Config vs ReefATLAS PAR Estimator

The clearest difference is in-app purchases: RMU2 Config at none against ReefATLAS PAR Estimator's 1. ReefATLAS PAR Estimator's advantage is update cadence (daily vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. ReefATLAS PAR Estimator sells 1 in-app purchase, starting at $4.99 per month. RMU2 Config asks for nothing beyond the download.

RMU2 Config ships an update every 3 months, ReefATLAS PAR Estimator daily. The most recent releases landed on October 20, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | RMU2 Config | ReefATLAS PAR Estimator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/reefatlas-par-estimator/id6777574663/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Daily** |
| Monetization | — | Subscription |
| Size | 22 MB | 27 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mobiltex Data](https://appshunter.io/developer/1050682800) | [JONATHAN ALBERT PITTMAN](https://appshunter.io/developer/6777574665) |

## What reviewers say

### RMU2 Config

[App page](https://appshunter.io/ios/app/rmu2-config/id1216879154)

**Features:** Vision Pro support

**In-app purchases:** none


### ReefATLAS PAR Estimator

[App page](https://appshunter.io/ios/app/reefatlas-par-estimator/id6777574663)

This app helps reef aquarium enthusiasts estimate and visualize light distribution without a PAR meter. It allows users to input tank dimensions, lighting equipment, and water conditions to predict PAR levels and make informed decisions about coral placement and lighting setups. The tool offers interactive 3D visualizations and supports a wide range of popular reef lighting systems.

**Highlights:** Interactive 3D PAR heatmap visualization, Support for popular reef aquarium lighting systems, Multi-fixture light array setup, Fixture placement and angle controls, Spectrum and intensity adjustment tools, Custom tank dimension configuration, Surface agitation and lid modeling

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ReefATLAS PAR Estimator Monthly | $4.99 | per month |


## Frequently asked questions

### Is RMU2 Config free?

RMU2 Config is free to download, with no in-app purchases.

### Is ReefATLAS PAR Estimator free?

ReefATLAS PAR Estimator is free to download, with in-app purchases available.

### Do RMU2 Config or ReefATLAS PAR Estimator have ads?

Neither RMU2 Config nor ReefATLAS PAR Estimator shows ads.

### Which is updated more often, RMU2 Config or ReefATLAS PAR Estimator?

RMU2 Config ships an update every 3 months, and ReefATLAS PAR Estimator daily. Most recently, RMU2 Config was updated on October 20, 2026 and ReefATLAS PAR Estimator on October 19, 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.*