App
Koi Pond Log: Water & Fish
Test Tracker & Goldfish Care
Log a pond water test in a few taps and Koi Pond Log tells you what it means: each reading gets an ok, watch or act mark against a published guideline, with the source on screen.
The first time you open it, hold your test tubes against the kit's colour card and tap the colours that match: pH and ammonia, plus the water temperature. The toxic share shows at once, and that reading becomes the first entry in your log.
Total ammonia alone doesn't tell you how much is toxic. Koi Pond Log works out the un-ionized ammonia at the pH and temperature you logged (EPA 2013, Emerson equation), so you know when to act. Today's feeding ration sits on the home screen, from your fish and the last water temperature.
FREE, NO FISH LIMIT
• Water test log: temperature, pH, ammonia, nitrite, nitrate, KH, GH, salt and dissolved oxygen, any subset per test
• Water quality marks with their sources (SRAC, EPA, Texas A&M), and an optional test reminder
• Pond volume in gallons and litres from shape and depth readings, or a volume you already know
• Koi and goldfish inventory with variety, length and notes; weight estimated from length
• Stocking load against the extension guideline for your pond
• Feeding guide: grams per day by water temperature, and "don't feed" below 45 °F
• One-tap feeding journal
PRO
• Trends: any reading charted against its guideline band, with daily feeding on the same timeline, plus growth per fish
• Salt calculator: salt to reach a target ppt, top-ups after a water change, and the 10:1 chloride dose for nitrite
• iCloud backup, a PDF pond report and CSV export of tests, fish, feedings and treatments
Built for koi and pond keepers who log on paper and retype into a spreadsheet. No account, no ads.
Pro is an auto-renewing subscription: $2.99 a month or $19.99 a year, each starting with a 7-day free trial. Payment is charged to your Apple ID when the trial ends. It renews automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel it in Settings › Apple ID › Subscriptions.
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Privacy Policy: https://curiouscrane.dev/koi-pond/privacy