ReefLog: Aquarium Water Tests

Log water tests, see every parameter against its target band, and catch alkalinity drift before the corals do. Dosing, livestock, maintenance, journal. iCloud sync.

ReefLog is a water test log for reef and aquarium keepers who want stable parameters. Log what you test, see every value against its target band, and catch a drifting parameter weeks before it becomes a problem. No account, no tracking. Everything lives on your device and in your private iCloud, and syncs across your iPhone, iPad, and Mac.

THE EIGHT NUMBERS THAT RUN A REEF pH, alkalinity, calcium, magnesium, nitrate, phosphate, salinity, and temperature. Log a full test day or just the alkalinity check; the parameter board always shows the latest value for each, colored by whether it sits inside your target range.

TARGET BANDS ON EVERY CHART Trend charts draw your target range as a band behind the line, with every reading colored in or out of range. Reef defaults for all eight parameters are built in, and every band is editable per tank, whether you run SPS hot at 8.5 dKH or keep a fish-only system.

CATCH THE DRIFT EARLY ReefLog computes the trend of every parameter and calls out the one moving fastest: "Alkalinity is drifting down, about 1.2 dKH over the last 21 days." A stability score tells you what share of your readings sat in range over the last 30 days.

A DOSING LOG THAT REMEMBERS Every dose records the product, the amount in ml, and the parameter it moves. Recent products refill with one tap, and the drift callout shows your last matching dose, so "did I already bump the dose?" has an answer.

LIVESTOCK AND CORAL REGISTRY Every fish, coral, and invert with a photo, species, source, and the date it joined the tank. Filter by kind and watch the registry become the story of your reef.

MAINTENANCE THAT STAYS ON SCHEDULE Water changes, filter floss, skimmer cup, refractometer calibration: set the interval once and ReefLog tracks due and overdue, with an optional reminder per task. A starter pack of common reef tasks is one tap.

A JOURNAL AND CLEAN CSV EXPORTS Date-stamped notes hold the story between the numbers. Export your tests, doses, and journal as CSV files with ISO dates and spreadsheet-safe decimals whenever you want your data elsewhere.

YOUR UNITS dKH or meq/L, specific gravity or ppt, Fahrenheit or Celsius, gallons or liters. Pick once in Settings; everything follows.

ON EVERY SCREEN YOU OWN ReefLog syncs across iPhone, iPad, and Mac with iCloud. The iPad layout puts the trend charts beside a grid of every parameter, a proper dashboard for a reef.

FREE VS LIFETIME Free includes 1 tank and 15 water tests with every tool: target bands, trend charts, dosing log, livestock registry, maintenance reminders, and journal. One lifetime purchase ($14.99 USD) unlocks unlimited tests, unlimited tanks, and the CSV exports. No subscription, no account.

ReefLog is a hobby log for your own records. Test, log, adjust. The reef stays boring, in the best way.