Aquarium water-test tracker
Read your water
like an instrument.
Log ammonia, nitrite and nitrate and Nitrify reads the curve — telling you your cycling stage, whether every reading is safe, and when the next water change is due. Pay once. No ads. No subscriptions.
NH₃ 0.0 · NO₂ 0.0 · NO₃ 40 ppm — Water: Watch
Know your cycle
Log your readings and Nitrify classifies the stage — establishing ammonia, nitrite spike, finishing, cycled. PRO predicts the date range your tank finishes cycling.
Is this reading safe?
Every reading gets a plain Safe / Watch / Act verdict against typical freshwater ranges. PRO breaks down every parameter — ammonia, nitrite, nitrate, pH, GH, KH, phosphate — with the target range and why.
Catch a reversal early
When a parameter shifts the wrong way — ammonia creeping back after it should be zero — Nitrify flags it before your fish show stress. PRO
Stay on schedule
Track water changes, recurring maintenance, and a dosing log. PRO adds due dates, reminders, custom cadence, and a dilution preview that shows what a change does to your nitrate.
Your tanks, your data
Multiple tanks, a photo journal of how each tank looks over time, a Home-Screen widget, and CSV export. iCloud sync across your own Apple devices — no account, no analytics, no server.
One price. Forever.
Free covers logging, your cycling stage, the safety verdict, one tank, and iCloud sync. Unlock Nitrify Pro for $6.99 once — cycling prediction, reversal alerts, the full per-parameter breakdown, unlimited tanks, scheduling & reminders, the photo journal, widget, and export. No subscriptions. No ads. No upsells.
