AquaKeeper: Fish Tank Tracker

AquaKeeper is an aquarium tracker and fish tank log for freshwater, planted, shrimp, brackish, saltwater and reef tanks. Log water tests, get maintenance reminders, check fish compatibility and read care sheets for 200 species – all offline, with no account and no subscription.

Keep every tank in one place. Add as many aquariums as you like, see a health score for each one, and let Tank Advisor tell you what to do next.

AQUARIUM WATER TEST LOG WITH CHARTS
• Track pH, ammonia, nitrite, nitrate, GH, KH, TDS and temperature, plus salinity, calcium, magnesium, alkalinity and phosphate for marine and reef tanks
• Charts show trends over time against the healthy range for your tank type
• Readings outside the range are flagged, and the tank's health score explains what is wrong and how to fix it
• Add a note to any test, for example after a water change or a new fish

AQUARIUM MAINTENANCE REMINDERS THAT FIT YOUR ROUTINE
• Recurring tasks for water changes, filter cleaning, testing, plant trimming, dosing and feeding
• Templates for common chores, or make your own schedule
• Reminder notifications at the hour you choose, with a Mark done button right in the notification
• Feeding and dosing routines, a cycling tracker for new tanks and a progress photo gallery

200 SPECIES WITH CARE SHEETS
• 114 fish (freshwater and marine), 30 shrimp, snails and other invertebrates, 32 aquatic plants and 24 corals
• Every care sheet lists temperature, pH, hardness, minimum tank size, diet, temperament and care level
• Search by name, filter by type and water, and save favourites in My species to compare side by side
• Add livestock to a tank and keep an eye on its stocking level

FISH COMPATIBILITY CHECKER
• Check tank mates before you buy: predator and prey pairs, aggressive species, and clashing temperature or pH ranges are flagged with a plain-language reason
• Works for community fish, cichlids, bettas, goldfish, shrimp tanks and reef invertebrates

CARE GUIDES, FISH DISEASE GUIDE AND PLANT DOCTOR
• 19 guides written for real tanks: cycling a new tank, acclimating and quarantining, water temperature, ammonia, nitrite and nitrate, pH, GH, KH and TDS, water changes, feeding, betta care, goldfish care, keeping shrimp, building a peaceful community, planted tank basics, algae control, reef water chemistry, starting a reef tank, a simple maintenance routine, and filter care
• Fish Disease Guide: match what you see to common diseases and their treatments
• Plant Doctor: tick the symptoms – yellow leaves, pale growth, pinholes, melting, algae – and get likely causes and fixes

AQUARIUM CALCULATORS
• Tank volume from dimensions, rectangular or cylinder, in litres or US gallons
• Water change calculator, including how much to change to reach a target nitrate
• Stocking calculator based on adult fish length and your real water volume
• Dosing calculator for any product strength

AQUARIUM JOURNAL, ANALYTICS AND ACHIEVEMENTS
• A journal for every tank: completed tasks and new livestock are logged automatically, and you can add your own notes
• Analytics across all your aquariums, and achievements that reward a steady routine

YOUR DATA STAYS YOURS
• Your tanks, tests and notes are stored on your phone, and every feature works without an internet connection. AquaKeeper never asks for an account
• No subscription and no limit on the number of tanks – AquaKeeper is free and supported by ads
• Export a full backup and restore it on a new phone
• Litres or gallons, °C or °F, and your own currency for costs

AquaKeeper is built for beginners setting up a first betta or goldfish tank, and for experienced aquarists running planted, shrimp, cichlid or reef tanks. Use it as a fish tank tracker, an aquarium manager or a simple tank log – it keeps your water stable and your fish healthy.