ReefLog – Reef Aquarium Log

ReefLog is a simple, private way to keep your reef and saltwater aquarium healthy. Log your water tests, stay on top of maintenance, and see at a glance whether your tank is in a safe range — all without creating an account. WATER PARAMETERS, MADE CLEAR • Log salinity, temperature, pH, alkalinity, calcium, magnesium, nitrate, phosphate and more. • Enter values in the units you actually use — ReefLog stores them consistently behind the scenes. • Instant out-of-range alerts when a reading drifts outside safe reef levels, so problems get caught early. TANK HEALTH AT A GLANCE • A dashboard that summarizes your tank's current status. • See your latest readings and what needs attention, without digging. TRENDS YOU CAN TRUST • Charts plot each parameter over time with safe-range bands, so you can see stability and spot swings before they become problems. NEVER MISS MAINTENANCE • Schedule water changes, dosing, filter media swaps, testing and more. • Local reminders notify you on time — nothing is sent to a server. KEEP TRACK OF YOUR TANK • Livestock registry for your fish, corals and inverts. • Equipment registry for pumps, heaters, lights and reactors. • Attach photos to your records (Pro). PRIVATE BY DESIGN • ReefLog is local-first: your aquarium data lives on your device. • No account, no sign-up, no cloud — and no third-party analytics or ads. FREE TO START The free version covers one tank with everyday logging. Upgrade to ReefLog Pro to unlock: • Unlimited tanks • Full history with 7/30/90-day charts • Unlimited maintenance reminders • Photo logs for your livestock and equipment ReefLog Pro is available as a monthly or annual subscription, or a one-time lifetime purchase. Subscriptions renew automatically until cancelled; you can manage or cancel anytime in your Google Play account. Whether you run a nano reef or a full-blown SPS system, ReefLog helps you keep your parameters steady and your livestock thriving.