Mobius vs Fish Tank Log
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.
Fish Tank Log
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.
- 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
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Fish Tank Log is a simple yet powerful aquarium tracker designed for freshwater, saltwater, planted, and shrimp tanks. Whether you manage one aquarium or several, Fish Tank Log helps you stay organized, log tank activity, and maintain consistent care routines. The app also includes an in app AI assistant that can guide you through tasks, answer questions, and help you stay on top of your aquarium with confidence. Aquarium Profiles: Create profiles for each tank and record livestock, equipment, and notes in one place so your aquarium information stays organized and easy to reference. Water Parameter Tracking: Log parameters such as pH, ammonia, nitrite, nitrate, temperature, and more while viewing charts to understand trends and maintain stable conditions. Maintenance Reminders: Set reminders for water changes, filter cleaning, dosing, and other recurring tasks to help keep your aquarium care routine consistent. Activity Log: Track feedings, livestock additions, observations, and maintenance events in a chronological timeline that captures the full history of your tank. Multi Tank Support: Manage multiple aquariums without switching apps or workflows, making Fish Tank Log useful for hobbyists with several tanks or breeding setups. Subscription Information: Creating unlimited tank profiles and accessing advanced features may require a subscription. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ For questions or inquiries contact: info@fishtanklog.com
Screenshots
Verdict
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.
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. 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.
| Parameter | Mobius | Fish Tank Log |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (331 ratings) | 5.0 (6 ratings) — better |
| Positive reviews | 26.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 331 — better | 6 |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 95 MB | 48 MB |
| Age rating | 4+ | 4+ |
| Developer | C2 Development, LLC | Toolit Media LLC |
Customer experience
Mobius
Fish Tank Log
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
Fish Tank Log
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Mobius
No in-app purchases
Fish Tank Log
- Fish Tank Log Pro3 Days trial$3.991 Month
- Fish Tank Log Pro$19.991 Year
- Fish Tank Log Pro$29.991 Year









