All-in-one
Parameters, maintenance, journal, calculators, planner, catalog, AI. No need to juggle 4 apps.
Best aquarium app
The best aquarium app of 2026, by people actually using it.
ReefFlow combines parameters, maintenance, journal, calculators, planner, Reefpedia and AI — all in one app focused on marine aquariums. Free.
Why ReefFlow is the best aquarium app for reef tanks.
The aquarium app market is fragmented: parameters-only apps, catalog-only apps, calculator apps, maintenance apps. Each covers a slice and pushes you to run three or four at once. ReefFlow took the opposite bet: a marine tank needs an integrated app where parameters talk to maintenance, journal cross-references stocking, and calculators feed dosing plans.
Instead of covering everything shallowly, ReefFlow specialized in marine and reef tanks. Target ranges are reef-tuned. Reefpedia species are saltwater. Calculators focus on salt mix, alkalinity, reef dosing. The ReefMind AI was trained on saltwater parameters. It is a focused app, not a generalist.
And it has a free plan. Core features (parameters, maintenance, journal, calculators, catalog) are in the free plan for 1 aquarium, with ads. A $1.99 plan removes ads. Higher tiers unlock multiple aquariums and advanced features.
Who it is for
- Anyone shopping for an aquarium app
- Reefers tired of running spreadsheets + Aquatic Notes + Aqualog at once
- Marine and reef tank keepers
- Reefers who want a free start with a low-cost ad-removal plan ($1.99)
- Reefers who want AI assistance with parameters
- Multi-tank keepers who want one place for everything
Marine/reef focused
Not a generic aquarium app with a blue theme. Built end-to-end for saltwater.
AI ReefMind
AI analyzes parameters, identifies patterns and suggests fixes. Real differentiator, not a buzzword.
Reefpedia 1,000+
Community-maintained encyclopedia with over 1,000 species.
Built-in calculators
Salt mix, alkalinity, Ca/Mg, water change, refractometer. No browser tab needed.
Free to start
Free plan covers 1 aquarium with ads. $1.99 removes ads; higher tiers unlock multi-tank and advanced features.
Download the best aquarium app for free.
iOS, Android. Free plan to start, $1.99 to remove ads.
FAQ — best aquarium app
What is the best app for a marine aquarium?
For marine and reef tanks, ReefFlow combines what other apps do separately — parameters, maintenance, journal, calculators, species catalog and AI — in one focused app, free.
Is ReefFlow better than Aquatic Notes / Aqualog / Aquarimate?
Each has a focus. Aquatic Notes is strong on parameters, weak on catalog. Aqualog covers catalog but charges for long history. ReefFlow integrates everything, specializes in marine and is free.
Is it really free?
There is a free plan with 1 aquarium and ads. A $1.99 plan removes ads. Higher tiers unlock multiple aquariums and advanced features (like heavy AI usage).
Does it work for freshwater too?
ReefFlow focuses on marine and reef. Reef dosing and Reefpedia are saltwater. Basic parameter logging works for freshwater but it is not the sweet spot.
Which languages?
English, Portuguese and Spanish — UI, content and support.
Is there a web version?
Calculators are on the web (reefflow.com.br/en/calculators). The main app is mobile (iOS and Android).