A fast, accurate reef companion: keyboard-free logging, safe dosing that shows its work, and camera diagnosis for algae, pests and coral health.
Built for the tank, not the desk — wet fingers, 1–3 taps per parameter. iPhone & Apple Watch.
Basic logging is always free and never behind a paywall. The intelligence is what you pay for.
Test kit in hand, wet fingers — tap ± to log alkalinity, Ca, Mg, NO₃, PO₄ and temperature. Instant unit conversion that never disagrees with itself.
Not a blind instruction. Every dose shows the formula that produced it and the safe daily limit — because a wrong dose costs a life.
Point the camera at algae, a pest or a struggling coral. Reeflow identifies it — and when it isn't sure, it says so instead of guessing.
Most reef apps lose trust, not features: they crash, they show 78.2°F as an error while 25.6°C reads fine, they misspell their way out of your confidence. Reeflow stores every value in one canonical unit and converts only when it's shown to you.
Reeflow reads your logged consumption trend and works out the dose for alkalinity, calcium and magnesium. Constants are derived from stoichiometry and verified against reef chemistry references — not transcribed from a forum post.
Try the free dosing calculator → Same formulas, same safety limits, no download.
Framing guide and a real capture gate, then an on-device-quality read of what's in your tank. A confidence threshold means Reeflow only commits to an answer when it's genuinely sure.
Recommended: isolate, treat with a targeted paste, and recheck in 3 days.
A confident wrong answer is worse than none. Below the threshold, Reeflow asks for a clearer photo instead of guessing — the opposite of a chatbot that always has to say something.
Maintenance reminders and a weekly test nudge fire as local notifications — and mirror straight to your wrist. Data stays on your devices.
Tank name, alkalinity, calcium and magnesium with a status dot each, plus your next overdue task — no chemistry on the watch, just the read-out.
Task-day reminders at 9 AM and a Friday-evening test nudge. Turn them on in one tap; they're local notifications, not push from a server.
Alkalinity status and overdue count right on your watch face, kept fresh over the local link between your phone and watch.
We're honest about what's collected. There's no ad tracking and no data selling, but analytics and subscription tools do collect some anonymous information — and we say exactly what.
Tanks, readings, doses, livestock and maintenance live in your private iCloud (CloudKit) database. No Reeflow server ever sees them.
Firebase collects app-interaction, crash and performance data plus a device identifier — not linked to your identity, and no IDFA / ad tracking.
A diagnosis photo is sent to our processing service and Google's Gemini API only when you choose to run a diagnosis — never in the background, never stored by us.
Sign in with Apple is optional and only links your subscription across devices. We never ask for your email; the app works fully without signing in.
Read the full Privacy Policy and Terms of Use.
Basic logging is never limited. Pro adds the parts that save your corals.
or $4.99 / month · cancel anytime
Reeflow is the reef log that doesn't crash, doesn't guess, and doesn't hide the math.
Download for iPhoneOn the App Store · iOS 18 · iPhone & Apple Watch