Fish Tank Tracker

Fish Tank Tracker is the lab notebook your aquarium deserves: log a full water test in seconds, watch the trends, and never miss another water change. Built for reef, FOWLR, saltwater, freshwater and brackish tanks — and built to work entirely offline, with no account and no subscription. TEN PARAMETERS, LOGGED IN SECONDS • Temperature, salinity, pH, ammonia, nitrite, nitrate, alkalinity, calcium, magnesium and phosphate • Quick mode for the everyday basics, Full Test for lab day • Optimal ranges shown while you type, notes on every test CHARTS THAT TELL THE STORY • Every parameter charted against its optimal band • Color-coded status on the dashboard: optimal, acceptable or critical at a glance • Spot a slow drift weeks before it becomes a problem LIVESTOCK JOURNAL • Fish, corals and invertebrates with species names and photos • Purchase dates, quantity, cost and health status EQUIPMENT & MAINTENANCE • An inventory of lights, pumps, heaters, skimmers and more • Recurring tasks per piece of equipment: clean the skimmer cup, swap filter floss, wipe the lens • A reminder notification when a task comes due, plus an optional weekly test-day nudge WATER CHANGES & DOSING • Log water changes by percent or volume • Dosing calculator for alkalinity, calcium and magnesium — pick your product, get millilitres for your exact water volume • Water change calculator for when dilution beats dosing YOURS, OFFLINE • Everything is stored in a local database on your device • No account, no login, no cloud, no tracking — and no ads • Gallons or liters, °F or °C FREE AND PRO The free version is a complete toolkit for one tank: all ten parameters with charts, a month of history, five livestock entries, and every equipment, maintenance and dosing tool. Pro is a single one-time purchase — never a subscription — and unlocks unlimited tanks, unlimited history, unlimited livestock, trend analysis with stability scores, and CSV export. Whether you are cycling your first ten-gallon aquarium or dialing in a mature reef tank, Fish Tank Tracker keeps the numbers so you can enjoy the fish.