Coral Compass Pro · $3/month · what's included
Save each tank as a profile (name and water volume), log your test results (alkalinity, calcium, magnesium, nitrate, phosphate, salinity, temperature), and see every parameter graphed over time. Every calculator on the site also gets a Save this result button for Pro members: reload past inputs with one click and graph any input or result over time. The two-part dosing planner can read tests straight from a saved tank.
Your tanks
Sample graph
Display 75 · Alkalinity (dKH), Oct 1–22
Sample data. Graphs are drawn on your device with plain SVG; no third-party chart or tracking scripts.
Your data stays in your account, is never sold or shared, and you can delete any entry. See the privacy policy.