Fish Tank Tracker vs ReefCompanion

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 (ppt or specific gravity), pH, ammonia, nitrite, nitrate, alkalinity, calcium, magnesium and phosphate - Quick mode for the everyday basics, Full Test for lab day - Optimal ranges and your last reading shown while you type, notes on every test - A reading that looks like a typo (42 for 420) is questioned before it's saved - Type phosphorus in ppb straight from a Hanna ULR checker - Type alkalinity in dKH, meq/L or ppm, as your test kit reads it - Set your own target range for any parameter, tank by tank - Log a test you took yesterday, or fix one you mistyped - Share any test as text, for a second opinion on the forums CHARTS THAT TELL THE STORY - Every parameter charted against its optimal band, over 30 days, 90 days, a year or all time - Tap a chart for any reading, with your water changes marked on it - Color-coded status on the dashboard: optimal, acceptable or critical at a glance - Every reading shows how it moved since your last test - 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 a weekly test-day reminder on the day and time you choose WATER CHANGES & DOSING - Log water changes by percent or volume, even from earlier days, and fix them later - Dosing calculator for alkalinity, calcium and magnesium — pick your product, get millilitres for your exact water volume - Big corrections are split into daily doses, never faster than the product's label allows - Dose straight from a test: the calculator starts from your latest reading and your own target - Water change calculator: how much salt to mix, and how far nitrate and phosphate will drop YOURS, OFFLINE - Everything is stored in a local database on your device - Free backup and restore: save everything to Files or Drive, and move it to a new phone - No account, no login, no cloud, no tracking — and no ads - Gallons or liters for each tank, °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 or dialing in a mature reef, Fish Tank Tracker keeps the numbers so you can enjoy the fish. Privacy policy: https://fish.chinesepowered.com/privacy.html

ReefCompanion makes it easy to track, understand, and care for your reef aquarium. Log water tests, monitor trends, manage equipment, and stay on top of maintenance—all in one clean, intuitive app designed for reef keepers of every experience level. Whether you’re maintaining a nano reef or a full mixed‑reef system, ReefCompanion helps you keep your tank stable, organized, and thriving. Key Features • Fast, simple water test logging Record Calcium, Alkalinity, Magnesium, Nitrate, Phosphate, Salinity, and more. Add notes and photos to track changes over time. • Beautiful trend charts Visualize your tank’s stability with 7‑day, 30‑day, 90‑day, and all‑time graphs. Spot patterns early and make informed adjustments. • Equipment tracking Keep a clean list of pumps, lights, skimmers, controllers, and other gear. Perfect for maintenance planning and upgrade tracking. • Maintenance reminders Set recurring tasks like carbon changes, skimmer cleaning, filter swaps, and more. Never forget an important job again. • Livestock organization Track fish, corals, and inverts with notes and photos. Keep a history of additions, removals, and observations. • Clean, modern design Built for clarity and speed. No clutter, no ads, no accounts required. Why ReefCompanion? A healthy reef depends on consistency. ReefCompanion brings your tank’s data together so you can make better decisions, catch issues early, and enjoy the hobby with confidence. Everything is stored privately on your device. No logins, no cloud accounts—just your reef, your data.