The logbook built for serious reefers.

ReefDeck is a client-side-first reef tank logbook. Your data lives in your browser's localStorage on your device. We do not hold your water chemistry data, and we never will in the free tier.

Important: ReefDeck is a logbook — not an aquarium advisor. It records the data you enter and displays it back to you with charts and threshold alerts you configure. ReefDeck does not provide advice, diagnose problems, or recommend actions. All decisions about your tank are yours.