Keep your reef steady.
Reef Stability tracks your alkalinity, calcium and magnesium — and tells you when to leave your tank alone.
Stop chasing your numbers.
Most dosing advice tells you to hit a target. Chasing that target is what bounces a tank between 8 and 10 dKH — and those swings stress coral far more than a steady 7.5 ever would. Reef Stability watches your trend and tells you the one thing to change, or that nothing needs changing at all.
Your consumption, from your own data.
Log what you test and what you dose. Reef Stability works out how fast your tank actually uses alkalinity, calcium and magnesium — not a number off a bottle, your number. Once it knows your consumption, it can tell you whether your daily dose is keeping up.
It tells you what to change — or to leave it alone.
When your dose falls behind, it says so, and by how much. When a reading wobble is just test-kit scatter, it stays quiet instead of calling it a crash. An app that sometimes tells you to do nothing is doing its job.
Every number has a source.
The chemistry comes from published work — Randy Holmes-Farley's articles, manufacturer data — not guesses. Every recommendation shows where it comes from, so you can check it, and defend it on the forum.
Your own data is free. Forever.
All your logging, your full history, every brand, every safety warning, and export of your own data are free — and always will be. You only pay for the intelligence: what to change and when. We don't hold your tank's data for ransom.
Reef chemistry calculators — no app needed.
Quick, sourced calculators for alkalinity, calcium and magnesium dosing. Free to use right here. Or read the reef chemistry guides.
Keep your reef steady.
Free to download. No account, no sign-up.
Coming soon to the App Store