# Mobius vs ReefATLAS PAR Estimator

The clearest difference is rating: ReefATLAS PAR Estimator at 5.0 against Mobius's 2.0. ReefATLAS PAR Estimator also leads on update cadence (daily vs every 2 months). Mobius's advantage is in-app purchases (none vs 1) and ratings volume (328 vs 1). 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. Mobius asks for nothing beyond the download.

ReefATLAS PAR Estimator holds the better App Store score, 5.0 against 2.0. That said, the two scores are not equally well evidenced: Mobius has 328 ratings behind it against 1, so its average is the more settled of the two.

Mobius ships an update every 2 months, ReefATLAS PAR Estimator daily. The most recent releases landed on October 9, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Mobius | ReefATLAS PAR Estimator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (328 ratings)](https://appshunter.io/ios/app/mobius/id1453744762/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/reefatlas-par-estimator/id6777574663/reviews)** |
| Number of ratings | **328** | 1 |
| Positive reviews | 27.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Daily** |
| Monetization | **Free** | Subscription |
| Size | 95 MB | 27 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [C2 Development, LLC](https://appshunter.io/developer/731463338) | [JONATHAN ALBERT PITTMAN](https://appshunter.io/developer/6777574665) |

## What reviewers say

### Mobius

[App page](https://appshunter.io/ios/app/mobius/id1453744762)

This app provides intelligent control for aquarium equipment, simplifying management of multiple tanks. Create custom scenes, schedules, and access quick status updates to maintain your aquatic environment with ease.

**Highlights:** Manage multiple tanks, Create custom scenes, Drag-and-drop scheduling, Lighting control with templates, Flow control for pumps, Dosing automation and tracking

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Easy to use
- 🚀 Intuitive interface
- 👍 Controllability of devices
- 👍 Potential for future improvements

**What reviewers complain about**

- 🐛 Connectivity issues
- 🐛 Time/date sync problems
- 🐛 Unreliable performance
- 🐛 Buggy and glitchy
- 🐛 Difficult to navigate

**Reported bugs**

- Constant disconnections
- Inability to add/connect devices
- Lighting schedule not working as expected
- Time/date resets randomly
- Crashes and freezes

**Requested features**

- Remote access and control
- Improved lighting schedule customization
- Pump/device off option
- Sync settings across devices
- Better documentation and tutorials


### 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 Mobius free?

Mobius 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.

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

ReefATLAS PAR Estimator is rated higher. Mobius averages 2.0 out of 5 from 328 ratings, while ReefATLAS PAR Estimator averages 5.0 from 1 ratings.

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

Neither Mobius nor ReefATLAS PAR Estimator shows ads.

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

Mobius ships an update every 2 months, and ReefATLAS PAR Estimator daily. Most recently, Mobius was updated on October 9, 2026 and ReefATLAS PAR Estimator on October 1, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*