Track Your Tank.
Keep Your Water Dialed In.
A free, private aquarium tracking app built for fishkeepers. Log pH, ammonia, nitrite, and nitrate from your API test kit in seconds — and spot trends before problems start.
Open Param TrackerFree forever. No account needed. Your data stays on your device.
Quick Test Logging
Dial in all four core parameters and log in under 15 seconds. Discrete steppers match your API Master Test Kit readings exactly.
Trend Charts
See pH, ammonia, nitrite, and nitrate trends over 7, 30, or 90 days with safe range bands. Catch drift before your fish show it.
Livestock Profiles
Track every fish, coral, and invert with species, count, status, and photos. Know exactly what's in your tank.
Maintenance Log
Record water changes, filter cleanings, and dosing. See how many days since your last change at a glance.
How It Works
Open the app and use the stepper dials to match your test kit readings
Tap "Log" — see color-coded safety feedback instantly
Watch trends over days and weeks to keep your tank stable and healthy
Works With Any Tank
Freshwater, saltwater, reef, brackish, or pond — safe ranges adjust automatically based on your tank type. GH/KH for freshwater. Salinity, calcium, and alkalinity for reef. Always the right parameters.
Your Data, Your Device
No accounts, no cloud, no tracking. Your tank data stays on your device and never leaves it. Works offline — even at the fish store with no signal.