Keep your reef tank thriving with Brack — the fastest, simplest water parameter logger for saltwater hobbyists. LOG IN 60 SECONDS Enter all 8 reef parameters in one quick session. Brack pre-fills your last reading so you only change what moved. INSTANT STATUS DASHBOARD See every parameter's safe zone status at a glance. Color-coded cards (green/yellow/red) tell you in 1 second if your reef is healthy. TREND CHARTS 4 weeks of history per parameter, visualized with Swift Charts. Safe zone overlays make it obvious when a value is drifting. Share any chart with one tap. 100% OFFLINE No account. No subscription. No cloud. Your data stays on your device — even in airplane mode on the way to your local fish store. REEF-SAFE ZONES BUILT IN pH · Ammonia · Nitrite · Nitrate · Alkalinity · Calcium · Magnesium · Salinity · Temperature — all reef-standard safe ranges baked in. ONE-TIME PURCHASE Pay once, own forever. No recurring fees, no feature paywalls. Brack is for reef hobbyists who want to track their parameters without friction. Log. See. Decide. Get back to enjoying your tank.