Never reef
alone.
Meet Nemo — a calm companion that learns your specific reef. He sees trouble coming from your own trends before it's a crisis, tells you what's normal before you panic, and gets sharper every day you keep your tank.
Month four. The coral's browning.
The forums say ten different things.
Every reefer hits the ugly stage — cyano, dinos, a nutrient swing, an alkalinity crash. It's the moment most people give up. It's the exact moment Reefr is built for.
Nemo remembers every reading, every photo, every fix — from your tank.
Not generic answers. Your alkalinity trend since day one. Your cyano bloom in March and what actually cleared it. A companion whose memory compounds the longer you keep your reef.
Reefr warns you first.”It’s known your tank since day one. ChatGPT just met you.
It sees the swing
before you feel the crash.
Stability beats hitting numbers — a fast alkalinity swing kills coral even while it's still "in range." Reefr watches your tank's own rate of change and hands you the one conservative thing to do next.
“Your alk's still in range — but it climbed 0.6 dKH in three days, and at this pace it'll cross your safe line by the weekend. Hold your dosing steady tonight; we'll recheck tomorrow. Nothing scary — just early.” — Nemo
Every day, the one true thing worth knowing about your tank.
Reefr isn't silent until something breaks. Open it any morning and Nemo tells you what actually matters today — a trend worth getting ahead of, a run of steady you should feel good about, or what's normal for the week you're in.
Your nitrate's still in range — but it's been sliding, and at this pace it'll dip low in a couple of tests. Ease off the export now and it's a non-event.
— NemoYour alkalinity's landed in range every test for 11 days straight. That's exactly the stability your coral wants — keep doing what you're doing.
— NemoA brown, dusty film is common around now — it's diatoms, the first of the "uglies." Totally normal, and it passes. Don't scrub in a panic.
— NemoHeld, oriented, and capable — from day one to your first anniversary.
One clear next step, always. Reefr grows with your tank — starting almost empty, unlocking depth only as you and your reef are ready.
Forecasts, doesn't just alarm
Nemo projects your own trends forward and flags what's heading the wrong way while your numbers still look fine — with the one conservative move to make now.
Knows the whole journey
It knows what month you're in. Cycling, the ugly stage, the turn — Nemo tells you what's normal before it happens, so the scary parts don't scare you.
Honest, humble, conservative
A companion with a clownfish face, not a chatbot. He hedges, says "confirm before you act," and never over-claims. Livestock are at stake, and he knows it.
Sharper every day you keep it
Event-sourced memory of one tank — every reading, photo and fix, forever. The longer you reef, the better Nemo knows YOUR tank. The moat forums can't match.
Reefr lives in your pocket —
right beside the tank.
Log a reading, snap the ugly stage, and hear Nemo's one calm next step — all from your phone, where reef-keeping actually happens. iPhone first; Android is on the way.
Your reef will have a memory.
Start it on day one.
Every reading from today makes Nemo sharper about your tank tomorrow. Start on day one, and by your first anniversary he'll know your reef better than anyone. Claim your spot in the first wave.
No spam. One email when your reef's companion is ready.