Free
$0
Pro
$3/month
- Two-part dosing planner from your test history, with doser schedule
- Carbon dosing ramp planner (vodka, vinegar, NO₃:PO₄-X)
- ICP results interpreter with trace dosing
- PAR and DLI lighting planner
- Return pump head loss and real flow
- GFO and lanthanum dosing
- Saved tank profiles and test log
- Saved history and graphs for every calculator
Pro tools
Two-part dosing planner
Daily two-part dose and doser schedule from your own test history.
Carbon dosing ramp planner
Week-by-week vodka, vinegar, or NO₃:PO₄-X ramp with a safety ceiling.
ICP results interpreter
Compare ICP results with seawater, flag metals, and get trace-element doses.
PAR and DLI lighting planner
PAR plus photoperiod and ramps into daily light integral, and back.
Return pump head loss and flow
Real return pump flow from lift, plumbing friction, and the pump curve.
GFO and lanthanum dosing
GFO charge size and lanthanum chloride dose split into safe daily steps.
Tank profiles + history graphs
Saved tanks, a test log, and graphs of every parameter and calculator result.
FAQ
How much is Coral Compass Pro? $3 per month, billed monthly. Cancel anytime from your account page; you keep Pro until the end of the period you paid for.
Do the free calculators stay free? Yes. Every existing calculator and the new heater, electricity, unit converter, and alk/calcium/magnesium dose calculators stay free with no account.
How do I sign in? With your email. We send a one-time sign-in link, so there's no password to remember or leak.
Is Pro available now? Not yet. Join the Pro waitlist and we'll email you when subscriptions open.
Payments will be handled by Stripe; Coral Compass never sees or stores your card number. See the terms and privacy policy.