TankDiary

Track pH, ammonia & more. Get reminders before water changes are overdue. One-time purchase — no subscription, no account. Your data stays on your device.

Track your aquarium's water quality and never miss a maintenance day. Simple, focused, and built for every type of tank — freshwater, planted, saltwater, or outdoor.

【Log Your Water Quality】 Record pH, temperature, GH, KH, ammonia, nitrite, and nitrate. Add up to 5 custom parameters. Your last reading is shown as a hint while you type, so entry is fast.

【Visualize Trends】 See parameters on a clean graph over 7, 30, 90 days, or all time — with the ideal range highlighted so you can spot problems at a glance. (30-day+ graphs require Pro)

【Maintenance Reminders】 Set repeating tasks for water changes, feeding, fertilizing, filter cleaning, CO2 refills, and more. The home screen shows "next maintenance in X days" for every tank.

【Reagent Timer】 Built-in 2, 5, and 10-minute countdowns — no more guessing when your test kit is ready.

【TankDiary Pro — One-Time Purchase】 • Register more than one tank • View graphs beyond 7 days (30 / 90 / all-time) • Export all water records to CSV

No subscription. No recurring fees. Ever.

【Perfect for every tank】 Freshwater, planted, reef, goldfish, shrimp, outdoor ponds — TankDiary works with any setup. Especially useful if you've ever: • Lost fish from a missed water change • Struggled to keep water parameters stable • Wanted an easier alternative to spreadsheets • Been managing multiple tanks (Corydoras, guppies, discus, goldfish, cichlids, shrimp...)

【Your data stays with you】 All records are stored on your iPhone or iPad. No cloud sync. No account required.

【No special hardware needed】 Works with any test kit or test strips. Just enter your readings manually.

【Pricing】 • Free: 1 tank, 7-day graphs, core features — free forever • TankDiary Pro (one-time, no subscription): multiple tanks, long-term graphs, CSV export

Developer: Kore Apps Support: support@kore-apps.com