Reef Ledger

Your reef, by the numbers. Reef Ledger is the saltwater keeper's logbook.

KNOW YOUR WATER Log alkalinity, calcium, magnesium, nitrate and more per tank - with trends that show drift before your corals feel it.

DOSE EXACTLY RIGHT The dosing calculator turns tank volume and target into exact amounts.

NEVER MISS MAINTENANCE Water changes, filter swaps, and feedings on schedule, with time-sensitive reminders.

UNLIMITED TANKS + CSV EXPORT Every tank in one place; export your full history anytime.

PRIVATE BY DESIGN Everything stays on this iPhone. No account, no cloud, no tracking.

One-time purchase. No subscription. Every feature included.

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