Tankbook

An aquarium log for freshwater and reef keepers. Log a full test day in seconds, watch the trends, and never miss a water change.

Logging your own tank is never paywalled. Unlimited entries, all parameters, full history, no account required, free forever.

Presets for freshwater community, planted, brackish, saltwater, reef, and pond tanks, with editable ideal ranges
90-day trend charts with the ideal range shaded and water changes marked
Livestock and plant tracking with free-typed species
Maintenance reminders that work offline with no account
CSV import and export, always free
Volume, water change, and unit conversion calculators