# AquaticLog vs ReefATLAS PAR Estimator

The clearest difference is rating: ReefATLAS PAR Estimator at 5.0 against AquaticLog's 4.2. ReefATLAS PAR Estimator also leads on update cadence (daily vs every 10 days) and iOS requirement (14.0 vs 18.1). AquaticLog's advantage is monetization model (freemium vs subscription) and ratings volume (407 vs 1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. AquaticLog sells 3 in-app purchases, starting at $4.99 per month and ReefATLAS PAR Estimator sells 1 in-app purchase, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReefATLAS PAR Estimator holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: AquaticLog has 407 ratings behind it against 1, so its average is the more settled of the two.

AquaticLog ships an update every 10 days, ReefATLAS PAR Estimator daily. The most recent releases landed on October 29, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | AquaticLog | ReefATLAS PAR Estimator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (407 ratings)](https://appshunter.io/ios/app/aquaticlog/id583895470/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/reefatlas-par-estimator/id6777574663/reviews)** |
| Number of ratings | **407** | 1 |
| Positive reviews | 69.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Daily** |
| Monetization | **Freemium** | Subscription |
| Size | 25 MB | 27 MB |
| Requires iOS | 18.1 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lonnex Inc](https://appshunter.io/developer/1547270716) | [JONATHAN ALBERT PITTMAN](https://appshunter.io/developer/6777574665) |

## What reviewers say

### AquaticLog

[App page](https://appshunter.io/ios/app/aquaticlog/id583895470)

Manage your aquarium with this comprehensive platform. Track water parameters, schedule maintenance, log livestock, and document your tank's progress with photos and videos. Connect controllers for automatic data import and sync across devices.

**Highlights:** Water parameter tracking, Smart reminders for maintenance, Livestock management, Equipment and dosing logs, Controller integration, Photo and video diary, Community features

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly Subscription | $4.99 | per month |
| Pro Yearly Membership | $39.99 | per year |
| Pro Lifetime Membership | $149.99 | one-time |


### 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 AquaticLog free?

AquaticLog is free to download, with in-app purchases available.

### Is ReefATLAS PAR Estimator free?

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

### Which has better reviews, AquaticLog or ReefATLAS PAR Estimator?

ReefATLAS PAR Estimator is rated higher. AquaticLog averages 4.2 out of 5 from 407 ratings, while ReefATLAS PAR Estimator averages 5.0 from 1 ratings.

### Do AquaticLog or ReefATLAS PAR Estimator have ads?

Neither AquaticLog nor ReefATLAS PAR Estimator shows ads.

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

AquaticLog ships an update every 10 days, and ReefATLAS PAR Estimator daily. Most recently, AquaticLog was updated on October 29, 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.*