Aqulator - Aquarium Manager

Aqulator Labs

In-app purchases

About this app

Aqulator is a free aquarium calculator and fish tank manager for freshwater and saltwater aquariums. Get accurate stocking levels and exact chemical doses in seconds.

Check tank mate compatibility across 250+ fish species before you buy. Log every water test and watch your parameters trend over time. One aquarium app instead of ten bookmarks.

AQUARIUM CALCULATORS

🐠 Stocking Calculator
Work out how many fish your aquarium can hold, based on real water volume and the bioload of every species you add. Surfaces the recommended water parameters for your whole stock list.

🔀 Fish Compatibility Checker
Check tank mates across 250+ freshwater and saltwater species. Aqulator flags conflicts in temperament or water parameter needs, then explains exactly why a pairing does not work.

⚗️ Chemical Dosing Calculator
Get the exact dose for over 450 aquarium products, scaled to your fish tank. Every product carries its own safety warnings.

📐 Tank Volume Calculator
Gallons or liters for rectangular, cylindrical, bowfront, or hexagonal aquariums. Shows filled weight too, so you know what your floor is holding.

💧 Effective Volume
Set your fish tank's usable water volume once, after substrate and hardscape. Every other calculator then doses the water you actually have.

🧪 RO Remineralization
Dial in GH and KH from RO water, whether you keep shrimp or run a planted aquarium.

Plus CO2 for planted tanks, heater wattage, ammonia toxicity, substrate depth, aquarium weight, water change volume, and a full unit converter.

YOUR FISH TANKS

🏠 Tank Profiles
Build a profile for every aquarium you own. Calculators, reminders, and logs all connect back to it, so a fishroom stays as organized as a single fish tank.

📊 Water Parameter Tracker
Log pH, ammonia, nitrite, nitrate, GH, KH, temperature, and your own custom parameters. Every reading becomes a chart you can scrub through to spot a problem before it turns into a fish loss.

📷 Photo Journal
Watch your aquascape fill in over months.

🏥 Quarantine Workflow
Run a medication schedule in your QT tank, then transfer stocking back to the display aquarium when treatment finishes.

📋 Aquarium Planner
Plan a build before you spend money on it. Stocking is checked as you go.

AI PHOTO TOOLS

🔬 Test Kit Scanner
Photograph a test strip or a liquid test kit. Aqulator reads the colors and fills your water parameters in for you.

⭐ Tank Rating
Photograph your aquarium for a score out of 10 with specific, honest feedback on what to improve.

MAINTENANCE THAT ACTUALLY HAPPENS

⏰ Smart Reminders
Schedule water changes, dosing, and filter maintenance against each aquarium. The dosing calculator feeds straight into a reminder with the exact amount already filled in. Turn on personality mode and your notifications arrive written from your fish's point of view.

🔥 Care Streak
Every day you log a parameter or tick off a task builds your streak. Milestones get celebrated. It turns aquarium maintenance into something you keep up rather than something you remember too late.

📅 Calendar Export
Push a tank's reminders into your own calendar app.

PLANS

Free covers every aquarium calculator, two tanks, and three reminders on each.

Aqulator Lite is a low cost monthly subscription that raises the limits to five tanks with ten reminders each, unlocks the full fish and chemical databases, and gives you a daily allowance of test kit scans.

Aqulator Pro is a one-time purchase with no subscription and no limits: unlimited tanks, unlimited reminders, unlimited scans, plus data backup and export.

Whether you are cycling your first betta tank or running a multi-tank fishroom, Aqulator is the aquarium app built for people who actually keep fish. Download it and stop guessing.

Ratings and reviews

Aqulator is super practical and actually useful. Everything you need is in one place — stocking calculator, dosing, compatibility check, heater sizing, water changes, CO₂, all of it. No guessing, no digging through forums. You just pick what you need and it gives clear, instant answers. Clean UI, fast, and makes aquarium setup and maintenance way easier.

Pretty solid app for keeping track of my aquariums. It’s easy to use, has a clean layout, and the variety of calculation tools makes managing water parameters way less of a hassle. Definitely a great pick individuals who maintain an aquarium and want something simple and straightforward. Highly recommend.

Must have if you own lots of tanks. UI is cleaner than many other aquarium apps

What’s new

• Aqulator Lite: a lower-cost subscription, alongside lifetime Pro
• Care Streak: track your consistency and celebrate milestones
• Refreshed Pro/Lite upgrade screen
• Parameter charts: scrub through your full log history
• Bug fixes: smoother onboarding, more reliable notifications