# Mobius vs Fish Tank Log

The clearest difference is review sentiment: Fish Tank Log at 100% against Mobius's 26%. Fish Tank Log also leads on rating (5.0 vs 2.0) and update cadence (every 2 weeks vs every 2 months). Mobius's advantage is in-app purchases (none vs 3) and ratings volume (331 vs 6). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Fish Tank Log sells 3 in-app purchases, starting at $3.99 per month. Mobius asks for nothing beyond the download.

Fish Tank Log holds the better App Store score, 5.0 against 2.0. That said, the two scores are not equally well evidenced: Mobius has 331 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 26% of Mobius's written reviews are positive against 100% of Fish Tank Log's.

Mobius ships an update every 2 months, Fish Tank Log every 2 weeks. The most recent releases landed on October 25, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Mobius | Fish Tank Log |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (331 ratings)](https://appshunter.io/ios/app/mobius/id1453744762/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/fish-tank-log/id6757759234/reviews)** |
| Number of ratings | **331** | 6 |
| Positive reviews | 26.1% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Freemium |
| Size | 95 MB | 48 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [C2 Development, LLC](https://appshunter.io/developer/731463338) | [Toolit Media LLC](https://appshunter.io/developer/1331221462) |

## 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


### Fish Tank Log

[App page](https://appshunter.io/ios/app/fish-tank-log/id6757759234)

This app helps aquarium enthusiasts track and manage their tanks. Log water parameters, schedule maintenance reminders, and record tank activities. An AI assistant provides guidance and answers questions to ensure consistent aquarium care.

**Highlights:** Create profiles for multiple tanks, Track water parameters with charts, Set maintenance reminders, Log tank activities chronologically, AI assistant for guidance and questions, Support for freshwater, saltwater, planted, and shrimp tanks

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fish Tank Log Pro | $3.99 | per month |
| Fish Tank Log Pro | $19.99 | per year |
| Fish Tank Log Pro | $29.99 | per year |


## Frequently asked questions

### Is Mobius free?

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

### Is Fish Tank Log free?

Fish Tank Log is free to download, with in-app purchases available.

### Which has better reviews, Mobius or Fish Tank Log?

Fish Tank Log is rated higher. Mobius averages 2.0 out of 5 from 331 ratings, while Fish Tank Log averages 5.0 from 6 ratings.

### Do Mobius or Fish Tank Log have ads?

Neither Mobius nor Fish Tank Log shows ads.

### Which is updated more often, Mobius or Fish Tank Log?

Mobius ships an update every 2 months, and Fish Tank Log every 2 weeks. Most recently, Mobius was updated on October 25, 2026 and Fish Tank Log on October 20, 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.*