# Smart Reef vs ReefATLAS PAR Estimator

The clearest difference is rating: ReefATLAS PAR Estimator at 5.0 against Smart Reef's 1.6. ReefATLAS PAR Estimator also leads on update cadence (daily vs every 3 months). Smart Reef's advantage is monetization model (free with in-app purchases vs subscription) and ratings volume (19 vs 1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Smart Reef sells 8 one-off in-app purchases 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 1.6. That said, the two scores are not equally well evidenced: Smart Reef has 19 ratings behind it against 1, so its average is the more settled of the two.

Smart Reef ships an update every 3 months, ReefATLAS PAR Estimator daily. The most recent releases landed on October 16, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Smart Reef | ReefATLAS PAR Estimator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.6 (19 ratings)](https://appshunter.io/ios/app/smart-reef/id1480355166/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/reefatlas-par-estimator/id6777574663/reviews)** |
| Number of ratings | **19** | 1 |
| Positive reviews | 3.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Daily** |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 4 MB | 27 MB |
| Requires iOS | 14.6 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Reef Factory sp. z o.o.](https://appshunter.io/developer/1367901113) | [JONATHAN ALBERT PITTMAN](https://appshunter.io/developer/6777574665) |

## What reviewers say

### Smart Reef

[App page](https://appshunter.io/ios/app/smart-reef/id1480355166)

Manage your marine aquarium with this app. It provides device management, alerts for issues, and detailed historical data. A central dashboard offers a clear overview of your aquarium's status and device operations.

**Highlights:** Device management, Aquarium alerts, Measurement history, Operational status dashboard, Planned job journal, Preset sharing

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Warranty 3 years | $12.99 | one-time |
| Warranty 3 years | $17.99 | one-time |
| Warranty 3 years | $19.99 | one-time |
| Warranty 3 years | $24.99 | one-time |
| Warranty 3 years | $29.99 | one-time |
| Warranty 3 years | $34.99 | one-time |
| Warranty 3 years | $39.99 | one-time |
| Warranty 3 years | $49.99 | 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 Smart Reef free?

Smart Reef 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, Smart Reef or ReefATLAS PAR Estimator?

ReefATLAS PAR Estimator is rated higher. Smart Reef averages 1.6 out of 5 from 19 ratings, while ReefATLAS PAR Estimator averages 5.0 from 1 ratings.

### Do Smart Reef or ReefATLAS PAR Estimator have ads?

Neither Smart Reef nor ReefATLAS PAR Estimator shows ads.

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

Smart Reef ships an update every 3 months, and ReefATLAS PAR Estimator daily. Most recently, Smart Reef was updated on October 16, 2026 and ReefATLAS PAR Estimator on October 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.*