# Mobius vs Reef Diary Aquarium Management

The clearest difference is rating: Mobius at 2.0 against Reef Diary Aquarium Management's 1.0. Mobius also leads on in-app purchases (none vs 4) and review sentiment (27% vs 0%). Reef Diary Aquarium Management's advantage is update cadence (monthly vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Reef Diary Aquarium Management sells 4 in-app purchases, starting at $2.99 per month. Mobius asks for nothing beyond the download.

Mobius holds the better App Store score, 2.0 against 1.0. 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. Written reviews point the same way: 27% of Mobius's written reviews are positive against 0% of Reef Diary Aquarium Management's.

Mobius ships an update every 2 months, Reef Diary Aquarium Management monthly. The most recent releases landed on October 9, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Mobius | Reef Diary Aquarium Management |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.0 (328 ratings)](https://appshunter.io/ios/app/mobius/id1453744762/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/reef-diary-aquarium-management/id6746352304/reviews) |
| Number of ratings | **328** | 1 |
| Positive reviews | **27.5% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | **Free** | Freemium |
| Size | 95 MB | 58 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [C2 Development, LLC](https://appshunter.io/developer/731463338) | [Christian Buchholz](https://appshunter.io/developer/1816370032) |

## 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


### Reef Diary Aquarium Management

[App page](https://appshunter.io/ios/app/reef-diary-aquarium-management/id6746352304)

Manage your reef or freshwater aquarium with this comprehensive tool. Track water parameters, schedule maintenance, and monitor your aquatic life and equipment. Works offline to keep your ecosystem healthy and thriving.

**Highlights:** Smart parameter tracking for reef and freshwater, Visual trend charts for water parameters, Multiple tank support, Equipment and livestock inventory, Maintenance task scheduler with reminders, Offline functionality

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reef Diary - Monthly | $2.99 | per month |
| Reef Diary - Yearly | $24.99 | per year |
| Enterprise Monthly Subscription | $89.99 | per month |
| ReefDiary Yearly Enterprise | $699.00 | per year |


## Frequently asked questions

### Is Mobius free?

Mobius is free to download, with no in-app purchases.

### Is Reef Diary Aquarium Management free?

Reef Diary Aquarium Management is free to download, with in-app purchases available.

### Which has better reviews, Mobius or Reef Diary Aquarium Management?

Mobius is rated higher. Mobius averages 2.0 out of 5 from 328 ratings, while Reef Diary Aquarium Management averages 1.0 from 1 ratings.

### Do Mobius or Reef Diary Aquarium Management have ads?

Neither Mobius nor Reef Diary Aquarium Management shows ads.

### Which is updated more often, Mobius or Reef Diary Aquarium Management?

Mobius ships an update every 2 months, and Reef Diary Aquarium Management monthly. Most recently, Mobius was updated on October 9, 2026 and Reef Diary Aquarium Management on October 4, 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.*