Fish Harmony vs Aquatrak
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fish Harmony
This app provides comprehensive compatibility data for various aquarium fish species, helping you determine if they will coexist peacefully. It also offers reef safety information for saltwater fish to protect your coral. Users can perform direct comparisons between two fish species.
- Fish compatibility data
- Reef safe ratings
- Freshwater and saltwater modes
- Fish-to-fish comparison
- Compatibility warnings
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Fish Harmony is meant to give comprehensive compatibility data for every type of aquarium fish. Not sure if a lionfish is compatible with a clownfish (hint: it isn't)? Fish Harmony will also let you know if that kind of fish is Reef Safe, Reef Safe With Caution or Not Reef Safe (in saltwater mode only, obviously!), to prevent your coral from being munched on! You can also use the Compare Fish-To-Fish button to do a 1:1 comparison of your chosen fish to another. For example, let's say you chose "Butterflyfish," and you want to see if it is compatible with Clownfish. You could just browse the "browse view" for Clownfish, but by clicking the "fish-to-fish", you can find the exact fish you are looking to compare with the Butterflyfish. Available for both freshwater and saltwater. Let us know what you think! Leave feedback or a review please! Thanks so much!
Aquatrak
This app helps users manage and learn about aquariums. It features a species library, educational guides, and tools to track water parameters and manage aquarium tasks. It aims to support both beginner and experienced fishkeepers.
- Comprehensive species library
- In-depth educational guides
- Water parameter tracking
- Personalized aquarium profiles
- Task manager for maintenance
- User account management
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Discover the transformative world of aquarium management with Aquatrak, your ultimate companion in successful fishkeeping. Whether you're a seasoned aquarist or a budding enthusiast, Aquatrak provides a comprehensive species library, in-depth educational guides, and a robust Parameter Tracking feature to monitor and manage water quality across saltwater, brackish, and freshwater tanks. Dive into our Species Library to learn about various aquatic species, their care needs, and optimal tank conditions. Our library is an ever-evolving treasure trove of information that grows with user recommendations for new species additions. Our Educational Guides are crafted to empower you with knowledge on maintaining healthy aquarium environments, caring for different species, and achieving optimal water parameters. It's a continual learning journey as the guide library expands with more topics based on your interests. Create and manage personalized aquariums in your profile, customize tank details, and keep an organized inventory of your aquatic species. Create a to-do list of aquarium-related tasks, such as water changes or species-care needs using the Aquatrak Task Manager. Assign tasks to a single date and time. Or, create custom schedules with a multiple date assignment or recurring schedules for your aquarium maintenance needs. User Account Management ensures a seamless sign-up process, easy modification of account details, and a secure user experience. Aquatrak prioritizes user privacy and data security, encrypting all user data for peace of mind. So, what are you waiting for? Join a community of aquarists and enthusiasts, and unleash the full potential of your aquarium-keeping journey with Aquatrak!
Screenshots
Verdict
The clearest difference is rating: Aquatrak at 4.4 against Fish Harmony's 3.4. Aquatrak also leads on update cadence (every 2 months vs every 9 months). Fish Harmony's advantage is iOS requirement (12.0 vs 16.0). On price, ratings volume, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Aquatrak holds the better App Store score, 4.4 against 3.4. Both are backed by a comparable volume of ratings — 10 and 5 respectively.
Fish Harmony ships an update every 9 months, Aquatrak every 2 months. The most recent releases landed on October 13, 2026 and October 20, 2026 respectively.
| Parameter | Fish Harmony | Aquatrak |
|---|---|---|
| Price | Free | Free |
| Rating | 3.4 (10 ratings) | 4.4 (5 ratings) — better |
| Positive reviews | — | 66.7% of reviews |
| Number of ratings | 10 — better | 5 |
| Update frequency | Every 9 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 33 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | Pat Canella | Nika Magradze |
Customer experience
Fish Harmony
Aquatrak
In-app purchases
Fish Harmony
No in-app purchases
Aquatrak
No in-app purchases






