Aquarium app for iPhone, Android & browser
Aqualizer shows whether your water parameters suit your tank and your animals, checks new livestock for compatibility, reminds you of maintenance and, if you like, explains with AI what to do next.
Coming soon to Google Play – try it now
Join the beta on Android
Real screens from the app, taken with the included example tank.
All 11 common values, from pH, GH and KH to nitrite, nitrate and ammonia, iron, CO₂ and conductivity. Target ranges follow your tank type, and the stability ring also checks against the needs of your animals and tells you why something is off.
Cycling, high nitrite, not tested in a while, CO₂ about to run out: Aqualizer shows what matters right now at the top of the tank and takes you straight to the right tool.
More than 200 reviewed species. When you add animals the app checks water parameters, minimum tank size, group size, predators, territorial behaviour and stocking by floor area. You always see the reasons, for free.
Suggestions for animals and plants that suit your water and your livestock. Star the species you dream of, the app shows them as soon as they fit into your tank.
A plant list checked against your parameters, with suggestions where the tank still looks bare. In the top view you place plants, wood and stones and see where filter and CO₂ sit.
How long will the cylinder last? Aqualizer uses your own history, reminds you about a spare and calculates the bubble rate for the target your plants and animals need.
How much tap and RO water for the next water change? The calculator aims for the hardness your animals need and plans big changes in gentle steps.
Water changes, filter, testing, pH probe: reminders with a notification at your chosen time, all free. The logbook records every reading, water change and livestock change, plus notes and photos.
The planning assistant asks about space, room temperature, wish animals, time and budget and suggests a suitable tank, with heater check, electricity cost at your country’s price, reviewed layout templates and a complete shopping list.
Many fishkeepers are sceptical about AI, and rightly so. That is why in Aqualizer the app first checks your parameters and livestock against fixed rules. The AI only explains and prioritises what the check found. All AI features are optional.
2 credits
The big picture of one tank from the last reading, livestock, plants and care: what is going well and what to do, sorted into “today”, “this week”, “when you get a chance”. Every step can become a reminder.
2 credits
Ask in your own words, for example “Can I add angelfish?”. The AI may only suggest species the compatibility check already knows for your tank, and every suggestion is checked again.
Photo 10 credits, plan 2 credits
Take a photo or pick the type: instant tips are free, the AI recognises the algae and builds a plan from your parameters. Treatments that harm shrimp or snails are removed from every plan.
Aqualizer works right away and everything stays on your device. A demo tank to try things out is included.
Automatic backup, your tanks in the browser too, 50 bonus credits once you confirm your email, and 10 instead of 6 credits every month.
Your tanks the same on phone, tablet and in the browser, plus insights, planning and 100 AI credits a month.
Colour is never alone: every traffic light also has a symbol, so it stays readable with red-green colour blindness.
Sign in to the app with the same email and password. Bring over your tanks, animals, plants, readings, reminders, logbook and photos with one tap. An active subscription simply continues at your current price. As a thank-you there is a welcome bonus of credits when you first sign in.
Sign in to the web app€0
from €2.50 / month
billed yearly (€29.99 / year), monthly plan also available
More credits without a subscription: a pack of 60 credits for €1.99 (in the browser) that never expire.
Right in your browser, no sign-up. In the app they use the values of your tank.
CO₂ from KH and pH, the pH setpoint for your controller and how long the bottle lasts.
Mix RO and tap water for your target GH and adjust your tank step by step.
Gross and net litres from the dimensions, with substrate, water level and glass thickness.
How many fish fit in your tank, by floor area instead of the outdated inch-per-gallon rule.
Litres for your water change and how far nitrate drops afterwards.
How many watts your heater needs and what it costs to run each month.
How much gravel, sand or soil you need, in litres, kilograms and bags.
Litres and gallons, °C and °F, °dH and ppm, conductivity and TDS.
Six questions, then you know which tank, equipment and running costs suit you.
What happens in a new tank in the first weeks and when the first animals can move in.
Identify the five most common algae and what you can do about them right away.
Yes. Water parameters, livestock and plant checks, CO₂ cylinder, calculators, all reminders, logbook and planning assistant are free and without ad banners. Pro is optional.
No. You can start right away and your data stays on your device. A free account adds automatic backup, more credits and your tanks in the browser. To sync between phone, tablet and browser you need Pro.
No. All checks, warnings and suggestions work without AI. The AI features are an extra on top and cost credits, which you only spend when you tap them.
Credits pay for AI requests: a tank analysis or a question to the stocking advisor costs 2, an algae photo recognition 10. You start with 50 and get new ones every month, 100 with Pro. If a request fails, you get them back.
Temperature, pH, GH, KH, nitrite, nitrate, ammonia/ammonium, phosphate, iron, conductivity and CO₂. The app works out CO₂ from KH and pH and the toxic share of ammonia by itself.
Community and nano tanks, shrimp, aquascapes, blackwater, cichlids, brackish and saltwater. Every type has its own target ranges.
Yes, for free. Without an account you try everything with the demo tank; with a free account you create your own tanks, kept in your account. With Pro they are the same on your phone and tablet too.
Your account moves with you: sign in to the app with the same email and password and bring over your tank data with one tap. An active subscription continues at your current price.
Download Aqualizer and set up your first tank in two minutes.
Coming soon to Google Play – try it now
Join the beta on Android
