Limno: Aquarium & Fish Tank

Water Test Log & Fish Guide

Free · Designed for iPad. Not verified for macOS.

Manage your aquarium with ease: log water tests, get alerts with the fix, look up every fish and shrimp in detail, and cycle a new tank step by step. Works offline. Keep your fish healthy and your plants thriving. Limno turns your own water test results into early warnings, step by step cycling guidance and clear answers about which fish and shrimp fit your tank. WHAT LIMNO DOES FOR YOU • Ammonia toxicity, worked out for your tank. Your test kit measures total ammonia. Limno estimates the toxic free ammonia (NH3) from total ammonia, pH and temperature, so you can tell when to worry and when not to. • Alerts that understand your tank. Limno watches how fast your values change and takes your tank setup into account. Every alert tells you the likely cause and what to do now. Planted tanks with CO2 injection do not get false pH alarms. • A cycling assistant that guides you. Fishless or with fish, Limno reads your ammonia, nitrite and nitrate tests, shows which stage your nitrogen cycle is in, what to do today, and why a cycle has stalled. WATER TEST LOG • Track pH, KH, GH, ammonia, nitrite, nitrate, phosphate, temperature, TDS, iron and copper. • Log a whole test session in seconds with presets and a built-in number pad. • Add old results from your paper notebook with their original dates. • Charts show water changes, dosing and new fish as markers, with the ideal range for the species you keep. FISH, SHRIMP & SNAIL GUIDE • 220+ popular freshwater species you can actually find in stores. • Search by common name in many languages or by scientific name, with or without accents. • Temperature, pH, GH and KH ranges, adult size, temperament, school size and minimum tank size. • Filter by fish, shrimp, snails, easy to keep, or species that fit your tank. • Missing a species? Add your own and keep going. FISH COMPATIBILITY CHECK • See if a new species fits before you buy it. • Checks water parameter overlap, aggression, fin nipping, fish that eat shrimp or snails, territory, school size and tank size. • Stocking level shown as a range, so you know when your tank is getting crowded. CARE & REMINDERS • Water changes, filter cleaning, fertilizer, feeding, trimming and your own tasks, every few days or on chosen weekdays. • Get reminded on time, then mark a task done, snooze it or skip it right from the notification. • Finished tasks appear on your charts, so you can see what changed your water. 8 AQUARIUM CALCULATORS • Tank volume with the real water volume, minus glass, substrate and hardscape. • Water change mixing with tap and RO water, target GH and KH, nitrate reduction, CO2 from pH and KH. • Salt, water conditioner and medication doses as a safe range, to check against your product label. PRIVATE & OFFLINE • No account, no sign up. Everything works offline, even in airplane mode. • Your tank data stays on your device. • Metric or US units, light and dark mode, iPhone and iPad. • Species data updates automatically. MADE FOR FRESHWATER KEEPERS Planted tanks, aquascapes, community tanks, betta and shrimp tanks. Whether you are setting up your first aquarium or running a high tech planted tank with CO2, Limno helps you read your water and act in time. Limno is built for freshwater only and does not cover saltwater or reef tanks. Set up your first tank in under a minute and log today's test.

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The developer, Nam Truong Phuong, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Used to Track You

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    The following data may be collected but it is not linked to your identity:

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    • Usage Data
    • Diagnostics

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Information

Seller
Nam Truong Phuong
Size
55.5 MB
Category
Lifestyle
Compatibility
Requires iOS 15.0 or later.
  • iPhone
    Requires iOS 15.0 or later.
  • iPad
    Requires iPadOS 15.0 or later.
  • iPod touch
    Requires iOS 15.0 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English and 2 more
  • English, German, Vietnamese
Age Rating
4+
Copyright
© 2026 Truong Phuong Nam
  • Developer Website
  • Privacy Policy

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