AquaCalculator vs Reefability
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
AquaCalculator
This app helps dedicated marine aquarists manage and document their aquariums. It tracks water parameters, manages animal stock, and calculates precise salt and nutrient additions. It also offers tools for adjusting calcium, alkalinity, and magnesium levels.
- Manage multiple aquariums
- Water value documentation with graphs and tables
- Animal administration with notes and pictures
- Recurrent memory for care tasks
- Salt quantity estimation
- Nutrient and chemical adjustment calculators
- Extensive setting options
Read full descriptionHide full description
The reference software for dedicated marine aquarists The AquaCalculator is not free. In order to be able to use the AquaCalculator permanently, you must complete a paid subscription after two weeks. In the first two weeks, the AquaCalculator can be tested for free and the subscription can be stopped at any time before it is chargeable. The app for documentation and management of your aquarium. The main focus is on saltwater aquariums but also their freshwater pools can of course be documented with the AquaCalculator. With the AquaCalculator you have the suitable manager at your fingertips to keep an eye on all important parameters regarding the care of your aquarium. A big request: unfortunately we can not respond to reviews. If you have problems with the app, please contact us via email shortly (Support). So far we could clarify every question :-) The reference software for every dedicated marine aquarist: - Manage several basins in parallel - Documentation of the water values in graph and table form per pool. You can document your water readings, take notes or deposit pictures. The pictures can also be commented on. - Animal Administration. You can also assign notes and pictures to your animals in the basin and thus get a quicker overview of the development of their stock. - Dates: Management of recurrent memories help to keep track of the care of aquariums - Realistic estimation of the required salt quantity of commercially available sea salt mixtures. How much salt is actually needed to "adjust the salt content" or for the next "water change"? AquaCalculator calculates this using self-determined measurements of almost all commercially available sea salt mixtures. - Addition of nutrients (nitrate and phosphate) - Calculator to adjust calcium / alkalinity / magnesium: Expensive special agents are passé. AquaCalculator calculates the exact dosing quantities and stock solutions required for the adjustment of calcium, alkalinity (KH) and Mg concentration of low-cost salts. Supports recipes from Aquafair, Aquaforest, Coral-Care, Fauna Marin, MT Aquaristics, Nyos, H.W. Balling, Price Aquaristics, A.Glaser, Red Sea, Sangokai, Tropic Marin, Fritz ProAquatics, Two Little Fishies, Kent Marine, Seachem, Brightwell, Continuum Aquatics, ESV and Self-Defined. - Extensive setting options for the measuring instruments used, as well as the chem. Recipes. - Mini-FAQ: answers the most important questions about adjusting the water values and thus the successful care of reef aquariums. Including ten thousand times downloaded seawater FAQs by Martin Kuhn (Water Parameter FAQ, Anemone FAQ, Plague Master FAQs 1 and 2) NOTE: We have provided iBooks from Apple for viewing the Seawater FAQs. The ad must have iBooks or another PDF viewing app installed on your device. To use the AquaCalculator you must have a valid subscription. This will enable you to take full advantage of the Aquacalculator, benefit from regular updates and enhancements, secure data storage and synchronization of your data with other devices. Without a valid subscription, you can only read but not modify your data. The term is one year. Payment will be made through your iTunes account. The subscription will automatically renew if it is not canceled 24 hours before the end of the current period. Within 24 hours before the end of the current period, the amount for the renewal will be charged. Termination of automatic renewal is possible at any time. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms of Use and Privacy: https://acalc.de/pages/impressum
Reefability
This AI-powered app offers scientific precision for managing coral reef aquariums. It analyzes microbiome health, water chemistry, and light optimization, and can identify issues from tank photos. It provides tools for hobbyists and professionals to maintain thriving reef ecosystems.
- AI-driven analysis of reef tank health
- Smart photo diagnostics for issue identification
- Evidence-based solutions and recommendations
- Ecosystem stability insights
- Professional tools for reef stores and professionals
- Integrated parameter monitoring
Read full descriptionHide full description
Transform your reef keeping experience with Reefability, the revolutionary AI-powered app that brings scientific precision and intelligent analysis to your coral reef aquarium management. Key Features: Comprehensive AI Analysis Our advanced AI model, trained with over a year of scientific research and evidence-based data, analyzes multiple aspects of your reef tank: Microbiome health Water chemistry Bioload balance Nutrient export efficiency Light optimization Flow dynamics Smart Photo Diagnostics Simply take a photo of your tank to: Identify potential issues Detect pests and problems Get real-time analysis Receive evidence-based solutions Ecosystem Stability Make informed decisions based on: Scientific research Real-world experience Comprehensive tank analysis Integrated parameter monitoring Professional Features: For Reef Stores: Enhanced customer service capabilities Livestock management tools Client communication features For Reef Professionals: Client tank monitoring Professional service integration Advanced diagnostic tools Reefability isn't just another aquarium app – it's your intelligent reef keeping companion that combines cutting-edge AI technology with proven scientific research to help you maintain a thriving reef ecosystem. Whether you're a hobbyist or professional, Reefability provides the tools and insights you need for successful reef keeping. Join us in revolutionizing the reefing hobby with technology that makes coral keeping more accessible, scientific, and successful than ever before.
Screenshots
Verdict
The clearest difference is rating: AquaCalculator at 3.7 against Reefability's 2.9. AquaCalculator also leads on review sentiment (67% vs 27%). Reefability's advantage is monetization model (free with in-app purchases vs subscription) and update cadence (every 4 days vs monthly). 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. AquaCalculator sells 5 in-app purchases, starting at $3.99 per month and Reefability sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.
AquaCalculator holds the better App Store score, 3.7 against 2.9. Both are backed by a comparable volume of ratings — 12 and 29 respectively. Written reviews point the same way: 67% of AquaCalculator's written reviews are positive against 27% of Reefability's.
AquaCalculator ships an update monthly, Reefability every 4 days. The most recent releases landed on September 21, 2026 and September 23, 2026 respectively.
| Parameter | AquaCalculator | Reefability |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (12 ratings) — better | 2.9 (29 ratings) |
| Positive reviews | 66.7% of reviews — better | 26.9% of reviews |
| Number of ratings | 12 | 29 — better |
| Update frequency | Monthly | Every 4 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Subscription | Free with in-app purchases — better |
| Devices | iPhone, iPad, Mac, Vision Pro — better | iPhone, iPad, iPod |
| Requires iOS | 18.6 | 15.0.0 — better |
| Further details — not scored | ||
| Size | 49 MB | 70 MB |
| Age rating | 4+ | 4+ |
| Developer | Thallos | Reefability |
Customer experience
AquaCalculator
Reefability
In-app purchases
AquaCalculator
- AquaCalculator monthly3 Days trial$3.991 Month
- AquaCalculator yearly14 Days trial$19.991 Year
- A large coffee$3.99
- Ice Tead and a Sandwich$9.99
- Something to learn$39.99
Reefability
- 1-Month$5.991 Month
- 12-Month$24.991 Year








