Mobius vs ReefATLAS PAR Estimator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Mobius
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.
- Manage multiple tanks
- Create custom scenes
- Drag-and-drop scheduling
- Lighting control with templates
- Flow control for pumps
- Dosing automation and tracking
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Mobius® is an innovative control platform for your EcoTech Marine products. A core rethinking of how products connect and function make Mobius one of the simplest and smartest control apps you'll ever use. Manage multiple tanks and get quick status updates from dashboard widgets. Easily create Scenes that are accessible to run from the dashboard. Scenes make repetitive tasks as simple as tapping a button. Creating schedules is a snap with Mobius's drag and drop interface. DASHBOARD - Run and create custom scenes using your equipment to make repetitive tasks easy. - Configure and organize your widgets so you can stay current with what is happening in your tank. - Quick access to your devices. LIGHTING - The lighting control interface makes creating a schedule easier than ever. - Proven templates make sure your tank gets off to a great start! - Use our coral acclimation mode to welcome your new livestock. - Save & share your customized templates. FLOW - Use our easy schedule editing interface to customize your Vectra & VorTech schedule. - Utilize all of our great pump modes like ReefCrest, Lagoon and Tidal Swell. - Initiate Feed mode to reduce the aquarium flow for spot-feeding. - Easily calibrate your Vectra with our simple walkthrough. DOSING - Auto Mode: Tell us the additive you're dosing and how much, we'll take care of when based on proven best practices. - Manual Mode: You're in control. Specify dosage and duration or rate. - Continuous Mode: Set a dosing rate, and your Versa will dose as long as it has power. - Easy Calibration - Keep track of how much additive is left in the containers, so you don't run out. - Need a one-time dose? Use Instant Dose to dose your tank quickly.
ReefATLAS PAR Estimator
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.
- 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
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ReefATLAS PAR Estimator is a subscription-based aquarium lighting analysis app built for reef keepers who want a smarter way to estimate light levels without always having access to a PAR meter. Designed for reef aquarium hobbyists and professionals, ReefATLAS PAR Estimator helps predict and visualize PAR distribution using tank dimensions, lighting equipment, mounting height, spectrum settings, fixture intensity, water conditions, lid transmission, surface agitation, and other key variables. The goal is simple: help reef keepers make better lighting and coral placement decisions before guessing, moving coral blindly, or copying someone else’s lighting schedule from a different setup. FEATURES • Interactive 3D PAR heatmap visualization • Support for popular reef aquarium lighting systems • Multi-fixture light array setup • Fixture placement using a top-down tank layout • Support for mixed light models in the same setup • Individual fixture height, position, rotation, and angle controls • Master/slave light grouping for linked fixtures • Spectrum and intensity adjustment tools • Manufacturer-style spectrum presets where available • Custom tank dimension configuration • Manufactured tank catalog support • Glass thickness and internal dimension calculations • Surface agitation / shimmer adjustment • Lid type and lid cleanliness modeling • Salinity-aware estimate adjustment • Project save and load functionality • Local device-based project storage • Optimized for reef aquarium planning and coral placement SUPPORTED LIGHTS ReefATLAS PAR Estimator includes modeled profiles for many popular reef lights, including AquaIllumination, EcoTech Marine, Kessil, Red Sea, ReefBreeders, Maxspect, Fluval, Illumagic, REEFi, Orphek, Philips CoralCare, NavaReef, Noo-Psyche, GHL, Current USA, and more. View the current supported light list here: https://thereefatlas.com/par-estimator-lights New lights and tanks are added regularly. If your light or tank is not listed, the app includes request buttons so you can send it in for review. Requested lights are prioritized for modeling when enough manufacturer/spec/PAR reference data is available. HOW IT WORKS Configure your aquarium dimensions, select your lighting equipment, adjust fixture placement, mounting height, spectrum, intensity, water conditions, and lid settings, then generate a 3D PAR distribution estimate throughout the aquarium. For single-light setups, quickly model one fixture over your tank. For advanced systems, the Light Setup tool lets you place multiple fixtures across a top-down tank grid, including mixed models, different mounting heights, fixture rotation, and angled mounting. The estimator calculates each fixture’s contribution at each point in the aquarium and combines overlapping light output to create the final PAR estimate. This helps represent real-world multi-light setups where beams overlap, spread, and converge across the tank. IMPORTANT ACCURACY NOTE ReefATLAS PAR Estimator is an estimation tool. A real PAR meter will always be the most accurate option for measuring your specific tank. However, many reef keepers do not have access to a PAR meter. This app is designed to provide a better starting point than guessing by combining modeled light profiles, tank dimensions, fixture placement, spectrum settings, mounting height, water depth, lid transmission, salinity, and surface agitation into one interactive estimate. Accuracy depends on available fixture data, setup inputs, and real-world variables such as rockwork, coral shading, water clarity, lens condition, and surface movement. SUBSCRIPTION REQUIRED ReefATLAS PAR Estimator requires an active monthly subscription to access and use the app. A subscription purchase is required to use the PAR estimation tools and features shown in the App Store screenshots and description. Privacy Policy: https://thereefatlas.com/privacy Terms of Use: https://thereefatlas.com/terms
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 September 26, 2026 and October 1, 2026 respectively.
| Parameter | Mobius | ReefATLAS PAR Estimator |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (328 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 27.5% of reviews | — |
| Number of ratings | 328 — better | 1 |
| Update frequency | Every 2 months | Daily — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Subscription |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 14.0 — better |
| Further details — not scored | ||
| Size | 95 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | C2 Development, LLC | JONATHAN ALBERT PITTMAN |
Customer experience
Mobius
ReefATLAS PAR Estimator
Bugs and requests
Mobius
Reported bugs
5 issues- Constant disconnections
- Inability to add/connect devices
- Lighting schedule not working as expected
- Time/date resets randomly
- Crashes and freezes
Requested features
6 requests- Remote access and control
- Improved lighting schedule customization
- Pump/device off option
- Sync settings across devices
- Better documentation and tutorials
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- Wi-Fi connectivity
ReefATLAS PAR Estimator
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Mobius
No in-app purchases
ReefATLAS PAR Estimator
- ReefATLAS PAR Estimator Monthly$4.991 Month
Questions
Is Mobius free?
Is ReefATLAS PAR Estimator free?
Which has better reviews, Mobius or ReefATLAS PAR Estimator?
Do Mobius or ReefATLAS PAR Estimator have ads?
Which is updated more often, Mobius or ReefATLAS PAR Estimator?
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