# Mobius vs HYDROS App

The clearest difference is rating: HYDROS App at 4.1 against Mobius's 2.0. HYDROS App also leads on review sentiment (64% vs 27%). Mobius's advantage is ratings volume (328 vs 17). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

HYDROS App holds the better App Store score, 4.1 against 2.0. That said, the two scores are not equally well evidenced: Mobius has 328 ratings behind it against 17, 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 64% of HYDROS App's.

Mobius ships an update every 2 months, HYDROS App every 3 months. The most recent releases landed on September 21, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Mobius | HYDROS App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (328 ratings)](https://appshunter.io/ios/app/mobius/id1453744762/reviews) | **[4.1 (17 ratings)](https://appshunter.io/ios/app/hydros-app/id1455344294/reviews)** |
| Number of ratings | **328** | 17 |
| Positive reviews | 27.5% of reviews | **63.5% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free | Free |
| Size | 95 MB | 69 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [C2 Development, LLC](https://appshunter.io/developer/731463338) | [CV Industries LLC](https://appshunter.io/developer/1455344293) |

## 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


### HYDROS App

[App page](https://appshunter.io/ios/app/hydros-app/id1455344294)

Easily monitor and control your aquarium's vital parameters like temperature, pH, and salinity. Manage all your connected devices, including ATOs, lights, and pumps, with a user-friendly interface. Quick setup with preset configurations means no coding is required to get your system running.

**Highlights:** Monitor temperature, ORP, pH, salinity, Control ATO, lights, heaters, pumps, User-friendly interface, Quick setup with presets, Manage multiple devices and aquariums, Set schedules and create modes

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mobius free?

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

### Is HYDROS App free?

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

### Which has better reviews, Mobius or HYDROS App?

HYDROS App is rated higher. Mobius averages 2.0 out of 5 from 328 ratings, while HYDROS App averages 4.1 from 17 ratings.

### Do Mobius or HYDROS App have ads?

Neither Mobius nor HYDROS App shows ads.

### Which is updated more often, Mobius or HYDROS App?

Mobius ships an update every 2 months, and HYDROS App every 3 months. Most recently, Mobius was updated on September 21, 2026 and HYDROS App on September 16, 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.*