StableReef tracks your water chemistry the same way a glucose monitor tracks blood sugar — continuous trend detection, noise-filtered alerts, and dosing recommendations tailored to your actual products.
Sign In−8 ppm / 4d
+0.01 ppm / 5d
Example dashboard — 75g SPS-dominated mixed reef
Enter readings from your Salifert, Hanna, or any other test kit. StableReef timestamps every entry and stores the full history.
Linear regression across your last 30 days of readings detects rising or falling trends — and filters out test kit noise so you only see real signals.
Tell StableReef what products you dose (BRS 2-Part, ESV B-Ionic, All for Reef, etc.) and it outputs the exact mL or grams to hit your target parameters.
Select your dosing products once. StableReef handles the maths — outputting amounts in the units that actually make sense for your setup.
Alkalinity
BRS 2-Part Alk (standard mix)
Current
8.0
dKH
Target
8.5
dKH
Add 17.6 mL of BRS 2-Part Alk
Calcium
BRS 2-Part Calcium (standard mix)
Current
412
ppm
Target
420
ppm
Add 11.4 mL of BRS 2-Part Calcium
Magnesium
Magnesium Chloride (MgCl₂·6H₂O, dry)
Current
1365
ppm
Target
1380
ppm
Add 36.0 g of Magnesium Chloride
Noise-filtered trend detection
Every parameter is calibrated against Salifert Profi-Test precision specs. A 0.2 dKH reading difference is within test kit noise — StableReef won't alarm you for that.
Linear regression, not last-reading comparison
Trends are calculated across your full 30-day window using OLS regression. One bad test can't flip the indicator.
Per-week velocity display
When you have enough data, rate of change is shown as /week — the unit reefers actually think in. "−0.5 dKH/wk" tells you more than "−0.07 dKH/day".
Your products, not generic formulas
Configure your dosing products once (BRS, ESV, All for Reef, Seachem, dry chemicals) and the calculator outputs the right mL or grams for your specific concentration.
Safe dosing schedules
If a correction is too large to dose safely in one go, StableReef automatically splits it across multiple days and tells you exactly how much each day.
Test history with trend window visibility
Every logged session shows whether it's inside the active 30-day window or archived — so you always know which readings are influencing your score.
StableReef is currently invite-only. If you have access, sign in to get started.
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