ReefCompanion

ReefCompanion makes it easy to track, understand, and care for your reef aquarium.
Log water tests, monitor trends, manage equipment, and stay on top of maintenance—all in one clean, intuitive app designed for reef keepers of every experience level.
Whether you’re maintaining a nano reef or a full mixed‑reef system, ReefCompanion helps you keep your tank stable, organized, and thriving.
Key Features
• Fast, simple water test logging
Record Calcium, Alkalinity, Magnesium, Nitrate, Phosphate, Salinity, and more. Add notes and photos to track changes over time.
• Beautiful trend charts
Visualize your tank’s stability with 7‑day, 30‑day, 90‑day, and all‑time graphs. Spot patterns early and make informed adjustments.
• Equipment tracking
Keep a clean list of pumps, lights, skimmers, controllers, and other gear. Perfect for maintenance planning and upgrade tracking.
• Maintenance reminders
Set recurring tasks like carbon changes, skimmer cleaning, filter swaps, and more. Never forget an important job again.
• Livestock organization
Track fish, corals, and inverts with notes and photos. Keep a history of additions, removals, and observations.
• Clean, modern design
Built for clarity and speed. No clutter, no ads, no accounts required.
Why ReefCompanion?
A healthy reef depends on consistency. ReefCompanion brings your tank’s data together so you can make better decisions, catch issues early, and enjoy the hobby with confidence.
Everything is stored privately on your device. No logins, no cloud accounts—just your reef, your data.