ReefLog: Reef Tank Tracker

The reef tank journal your corals deserve. Track Ca, Alk, Mg + all 8 parameters. One tap to log. Offline forever. No subscription.

Track your reef tank's critical parameters and never lose a coral to preventable parameter swings.

ReefLog is built specifically for reef and saltwater aquariums — not generic fish tanks. Log calcium, alkalinity, magnesium, phosphate, nitrate, salinity, pH, and temperature in seconds. Your entire tank history in one place, always offline.

WHAT MAKES REEFLOG DIFFERENT • Designed for reef chemistry — the Ca/Alk/Mg triad is front and center • Instant health indicator — green/yellow/red based on your actual values vs. safe ranges • Multiple tanks — manage a display tank, frag tank, and sump separately • Water change log — never forget when you last changed water • Coral inventory — track what you have, what it cost, and how it's doing • 100% offline — no account, no subscription, no cloud required

WHO IT'S FOR Hobbyist or advanced reefer running a mixed reef, SPS, LPS, or FOWLR tank. If you've ever killed a coral because you forgot to test alkalinity, this app is for you.

PRIVACY ReefLog stores all data locally on your device. Nothing is sent to any server.