AquaLog: Aquarium Water Tests

AquaLog shows you which tank needs attention — and what to do about it.

Log water tests in seconds, see every reading against its safe range, and get reminded before a water change is overdue. Freshwater, planted, saltwater or reef.

SEE WHAT NEEDS YOU • One home screen for all your tanks: problems first, then what's due, then the stable ones • Out-of-range readings come with a plain explanation and a suggested next step

LOG A TEST IN SECONDS • Tap a value instead of typing — your last result is right there • pH, ammonia, nitrite, nitrate, temperature, KH, GH, salinity, calcium, magnesium and phosphate

SPOT PROBLEMS EARLY • Every chart shows the safe range as a band of water, so a bad trend stands out • Water changes are marked on the chart, so you can see what they did

STAY ON SCHEDULE • Reminders for water changes, feeding and cleaning • Keep track of livestock, equipment, food and maintenance for each tank

BUILT FOR KEEPERS • Dark mode first, with a light mode • iPhone and iPad, synced with iCloud • No ads, no account

FREE AND PRO Your first tank is free, with every feature: tests, trends, reminders and CSV export. AquaLog Pro unlocks unlimited tanks and lets you share equipment and food between them. Choose a monthly or yearly subscription, or a one-time lifetime purchase.

Payment is charged to your Apple Account when you confirm the purchase. Monthly and yearly subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period, and your account is charged for renewal within 24 hours before the period ends. You can manage or cancel your subscription in your Apple Account settings at any time.

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