Aquarium water test tracker
Log every water test, watch trends against safe ranges per tank, and get a conservative next step when something drifts — offline, on your device, forever.
Works offline · No account · One-time $11.99 · Export anytime
Features
Water changes, doses, and filter cleans plotted right on the trend line, so cause and effect is visible at a glance — not buried in a log.
Alk 7.2 → target 8.4 dKH: dose 18 ml for your 75 gal, re-test in 24h before dosing again. Always shows the math. Never chains doses without a re-test.
Green in-range, amber drifting, red out — with the arrow versus your last test, for every parameter that matters to your tank type.
Freshwater tanks track pH, ammonia, nitrite, nitrate. Reef tanks add alk, calcium, magnesium, salinity, phosphate. Pick a preset, get the right grid.
1M/3M/1Y views per parameter, with the safe range shaded so you can see drift building before it becomes a problem.
Name, type, volume, photo — switch between every tank you keep, each with its own history that stays on your device.
Pricing
1 tank, core parameters.
Unlimited tanks, all parameters.
Pay once. Keep it forever. No subscription.
FAQ
Yes. Every test, trend, and reminder lives on your device. No internet connection required, ever.
No. There's no sign-up, no login, and no cloud sync of your data.
No. One payment of $11.99 unlocks unlimited tanks and every feature, for as long as you use the app.
Yes. Export any tank's full test history to CSV whenever you want.
iPhone and iPad, running current iOS.