Coralog: Reef Aquarium Log

Track your reef tank in one calm place. Spot parameter drift early and see the estimated dose to bring each value back into range.

Keeping a reef is a balancing act. Alkalinity, calcium, magnesium, nitrate, phosphate — your corals live or die by how steady you hold them. Coralog is a calm, private place to track it all and catch a swing before it costs you a colony.

WHAT YOU CAN DO • Log every test in seconds — values show green, amber, or red against your target range, the moment you enter them • Keep your dosing on schedule with countdowns and a tap to mark each dose done • Track your livestock — corals, fish, inverts — with photos, sources, and how long they've been in your reef • See every parameter's trend over time, with your target band drawn right on the chart

FREE — NO ACCOUNT NEEDED Log unlimited parameters and doses, track your full livestock list, and see your trends across weeks and months. Export your own data as a CSV. Nothing core is locked behind a paywall.

PREMIUM — 7-DAY FREE TRIAL, THEN $6.99/MONTH OR $39.99/YEAR • Drift watch: see which parameters are trending out of range — and roughly how many days you have before they do • Dosing calculator: the calculated ml to raise alkalinity, calcium, or magnesium to your target for your tank volume • Cancel anytime from your Apple ID settings

PRIVATE BY DESIGN Everything you record stays only on your device. Coralog never uploads, syncs, shares, or sells your data. No account needed.

Coralog is a husbandry log. It does not provide water-chemistry or veterinary advice and is not a substitute for your own testing and judgment. Dosing figures are estimates — always verify against your additive's label and dose gradually.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/