ReefLog: Reef & Tank Care

New: parameter trend charts with ideal-range overlays — catch problems before they hurt your tank.

ReefLog is the simple, private way to keep your aquarium healthy — track water parameters, spot trends early, and never miss a water change.

LOG WATER TESTS Record salinity, pH, temperature, nitrate, ammonia, alkalinity (KH), calcium and phosphate. ReefLog instantly tells you whether each reading is In Range, High or Low for your tank type (reef, saltwater, planted or freshwater).

SEE TRENDS BEFORE THEY BECOME PROBLEMS Beautiful parameter charts overlay your ideal range, so you can catch creeping nitrate or swinging alkalinity before your livestock pays the price.

NEVER MISS MAINTENANCE Set recurring water changes, dosing, feeding, testing and cleaning. See exactly what's due today, overdue, or coming up — per tank.

MULTIPLE TANKS Manage your reef display, planted nano and quarantine tank side by side.

PRIVATE BY DESIGN All your data stays on your device. Optional iCloud sync keeps it in your own private iCloud across your devices — we never see it. No account, no ads, no tracking.

ReefLog Pro (one-time purchase, no subscription) unlocks unlimited tanks, full history, CSV export, smart out-of-range alerts and custom schedules.