poolcntrl
It remembers your pool, so you don’t have to.
Test your water, get the exact amount to add — in cups and jugs, not chemistry. poolcntrl remembers your pool’s volume, its surface, and the chemicals actually in your garage, so every plan is measured against your water instead of a generic one. Same inputs, same answer, every time.
Free for two weeks — the whole app, no credit card. Then $49.99 a year, less than one visit from a pool service. See what Pro includes →
How poolcntrl works
Everything a pool service does for you — guided, transparent, and in your own hands.
Test your water in a couple of easy steps
Snap your test strip or enter readings by hand. poolcntrl pairs your results with local weather and AI visual analysis of your pool — comprehensive insight no test kit alone can give you.
Follow simple, guided steps
You get an exact, plain-English plan for the chemicals you already own — how much to add and when. No charts, no math, no guessing.
It watches the water between tests
poolcntrl tracks your readings, your weather and your history, and nudges you before a problem starts. AI helps read your strip and spot cloudy water — it never picks the dose. Every number you’re told to add comes from the same deterministic chemistry, every time.
When the season ends, poolcntrl goes quiet.
Closing up for winter? A guided checklist walks you through winterizing, and the moment you mark the pool closed the reminders stop — no nudges about water nobody is swimming in. When the forecast warms up in spring, poolcntrl asks whether you are ready to reopen and walks you back from green to swimmable, one test at a time.
Read the closing & opening checklists →Built for owners who’d rather just get it right.
Confidence Engine
Deterministic chemistry math — same inputs, same answer, every time. Open any dose and see the arithmetic that produced it.
Zero-Friction Input
Test strip scan or manual entry. We pick a target, you log what you added, we update next time.
AI reads, chemistry decides
AI helps read your strip and sees your pool — then the deterministic engine takes it from there, guiding and managing the whole routine so you always know the next move.
Get a taste of the poolcntrl experience.
This is the actual chemistry engine running in your browser, against an 18,000-gallon plaster chlorine pool. Adjust readings or pick a scenario to see the kind of guidance you’d get every day.
Water test
Recommendation
Do this today- Add 69 fl oz (about 8½ cups) of Liquid Chlorine 10%Brings free chlorine to 5 ppm. Retest in 4 hours.⚠️ Strong oxidizer — wear gloves and eye protection.
That dose is real — the same deterministic engine the app runs, same answer every time.
What Pro adds is memory. It already knows your gallons, your surface and the chlorine in your garage — so you skip every field above. It checks your next test against this dose to tell you whether it actually worked, and it reminds you when to retest.
Engine ruleset mvp-seed-v1.7.0
What a saved pool does that a one-off answer can’t.
New to all this? We'll walk you through it.
Friendly, no-jargon guides to what your water is telling you and what to do about it — written for first-time owners.
Start your free trial.
Two weeks with everything unlocked — no credit card. poolcntrl saves every water test, shows your trends over time, and tells you when to retest. The same login works across the app and the web. After the trial it’s $49.99 a year, or you keep using the free calculator forever.
Download poolcntrl now
Take your pool’s perfect routine with you. Free to start on iPhone — Android is on the way.
On Android?The full chemistry engine runs free in your browser — the same server-side math the iPhone app asks for, and the same answer. No app to install, no account needed.Open the free calculator →One subscription, every device — phone at the pool, laptop at the kitchen table.