# ReefCtrl vs ReefATLAS PAR Estimator

The clearest difference is in-app purchases: ReefCtrl at none against ReefATLAS PAR Estimator's 1. ReefATLAS PAR Estimator's advantage is update cadence (daily vs every 9 days). 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. ReefCtrl asks for nothing beyond the download.

ReefCtrl ships an update every 9 days, ReefATLAS PAR Estimator daily. The most recent releases landed on September 3, 2026 and July 9, 2026 respectively.

## The numbers

| Metric | ReefCtrl | 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** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Daily** |
| Monetization | **Free** | Subscription |
| Size | 3 MB | 27 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jayanth Vignesh Ramachandran](https://appshunter.io/developer/1896691974) | [JONATHAN ALBERT PITTMAN](https://appshunter.io/developer/6777574665) |

## What reviewers say

### ReefCtrl

[App page](https://appshunter.io/ios/app/reefctrl/id6769832090)

Manage your reef aquarium with this intelligent platform. Monitor equipment, track water chemistry, and receive smart alerts. It integrates with Neptune Apex controllers and offers AI-powered assistance for hobbyists.

**Highlights:** Neptune Apex integration, Smart alerts and notifications, Water chemistry tracking, Dosing management, AI reef assistant, Equipment and livestock management

**Features:** macOS Compatibility

**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 ReefCtrl free?

ReefCtrl 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 ReefCtrl or ReefATLAS PAR Estimator have ads?

Neither ReefCtrl nor ReefATLAS PAR Estimator shows ads.

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

ReefCtrl ships an update every 9 days, and ReefATLAS PAR Estimator daily. Most recently, ReefCtrl was updated on September 3, 2026 and ReefATLAS PAR Estimator on July 9, 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.*