Reef Book

Smart Logbook for Aquarists Record a water test in seconds, see whether each reading is in range, and follow how your aquarium changes over time. Reef Book keeps every aquarium’s history together across iPhone, iPad, and Mac. Set up each reef, planted tank, freshwater aquarium, or other aquatic system with the parameters you test, the units you use, and the ranges you want to maintain. Record Without Friction • Open Quick Record from the app, a widget, or a Shortcut • Type an exact value or adjust it with a precision slider • Keep repeated tests as separate readings instead of losing the individual results • Mark frequently tested parameters as favorites for quicker access Understand Your Results • See which readings are within range and which need attention • Follow changes across recent results or your complete history • Use the activity heatmap to see when you tested and spot gaps • Compare supported conversions directly from a logged reading • Add notes and suggested tags for maintenance, dosing, livestock changes, and other events Share and Stay in Sync • Invite other aquarists to view or contribute to the same logbook • Create a shareable summary, preview it, and choose what to include • Keep every device up to date through iCloud • Schedule automatic backups and choose how many to keep • Use Reef Book without creating another account Plus fun iMessage stickers!