Test your water, log it in seconds, and ReefLog tells you what to do — specific, safe advice from your own readings, not just another chart.
See what's inside →ReefLog combines your live readings, their trends, and reef-chemistry facts to reason across parameters — the way a seasoned reefer would.
Alkalinity is low at 6.4 dKH, and magnesium is only 1180 ppm — under the 1300 it needs. Without enough magnesium, calcium carbonate keeps precipitating out, so alkalinity falls no matter how much you dose.
Fast to log, honest about the numbers, and private by design.
Alkalinity, calcium, magnesium, nitrate, phosphate, salinity, temperature and pH — each with its safe target range and a live in-range check.
Out-of-range or drifting? ReefLog explains why and tells you exactly what to do — direction-specific, coral-safe, sourced from real husbandry.
Calibrate a supplement once to your tank and ReefLog computes the exact mL to dose — split safely across days, never guessing a product's strength.
History charts with your ideal band, a tank-stability score, and projections that warn you before a parameter leaves range.
Water changes, testing, filter and skimmer upkeep — scheduled and reminded, all on-device.
No accounts, no servers, no tracking. Your tank data never leaves your phone. Export to CSV any time.
The whole app is free for your tank. Pay once — only if you keep more than one.