TankDiary: Aquarium Tracker

The aquarium logbook that respects your wallet: pay once, own it forever. No subscription, no account, no ads — your tank data stays on your phone. Built freshwater-first. Planted tanks, community tanks, shrimp, bettas — with the parameters you actually test. TRACK WHAT MATTERS Log temperature, pH, ammonia, nitrite, nitrate, GH, KH, TDS and more in one quick sheet. Color-coded safe ranges tell you at a glance if something's drifting. Beautiful charts show trends over weeks or years — with the safe zone drawn right on the graph. NEVER MISS A WATER CHANGE Set maintenance schedules for water changes, filter cleans, dosing, and trimming. Reliable local reminders at the time you choose. Overdue tasks are one tap to complete. YOUR WHOLE TANK, REMEMBERED Livestock list with photos — fish, inverts, plants. A photo journal for milestones, rescapes, and diary notes. Everything works offline. Export your readings to CSV for free. HONEST PRICING Free forever: 1 tank, working reminders, 30 days of history, CSV export. TankDiary Pro unlocks unlimited tanks, full history, and manual backups — as a one-time purchase. There's a yearly option too, but we think you'll prefer to just own it. No account. No cloud lock-in. No selling your data — it never leaves your device. Made by a hobbyist who got tired of spreadsheet water logs. Privacy Policy: https://tankdiary.com/privacy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/