poolcntrl
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Pricing

$5.99 a month, or $49.99 a year.

Free is the calculator, forever. Pro is where poolcntrl keeps your pool.

Every new account starts with a 2-week free trial — everything unlocked, no card.

Monthly$5.99per monthBegins when your 2-week free trial ends. Cancel any time.
AnnualThree months free$49.99per yearThat’s $4.17 a month, billed annually at $49.99.Begins when your 2-week free trial ends. Cancel any time.

One subscription, every device — phone at the pool, laptop at the kitchen table.

Download on theApp StoreDownload the appTry the free calculator

What you get on each plan

Free versus poolcntrl Pro, feature by feature.
FeatureFreePro
Dosing calculatorEnter your readings, get the exact amount. No account, no limit, forever.Dosing calculator — included in FreeDosing calculator — included in Pro
Create an accountSign in on the app or the web. It stays free.Create an account — included in FreeCreate an account — included in Pro
Save your property and poolVolume, surface and sanitizer, saved once. Every dose is sized to your pool.Save your property and pool — not included in Free (nowhere to keep your pool between visits)Save your property and pool — included in Pro
Recommendations & dose loggingLog the chlorine you added. Your next test is checked against it.Recommendations & dose logging — not included in Free (the free calculator still gives you the dose — logging it needs an account)Recommendations & dose logging — included in Pro
Water test historyEvery test, dose and note kept, with what happened next.Water test history — not included in Free (needs an account that keeps your data)Water test history — included in Pro
Trends over timeA chart for every reading, so a drift shows before a problem does.Trends over time — not included in Free (nothing is saved, so there is nothing to chart)Trends over time — included in Pro
Reminders & notificationsOn your pool’s own cadence, plus weather and filter notices.Reminders & notifications — not included in Free (without a saved pool there is no cadence to remind you about)Reminders & notifications — included in Pro
AI test-strip scanPhotograph the strip. AI reads the pads into your test.AI test-strip scan — not included in Free (every scan is a real AI call we pay for)AI test-strip scan — included in Pro
AI pool diagnosisPhotograph the water. Get a likely cause and what to check next.AI pool diagnosis — not included in Free (photo diagnosis is an AI call we pay for, every time)AI pool diagnosis — included in Pro
Weather forecastsHeat, rain and storms show up as advice before they show up in your water.Weather forecasts — not included in Free (needs a saved address to forecast for)Weather forecasts — included in Pro
Multiple pools & propertiesEvery pool and property you look after, in one account.Multiple pools & properties — not included in Free (starts with the first pool you save)Multiple pools & properties — included in Pro

About additional properties

One subscription covers every pool and property on your account today — there is no per-property charge.

What you keep, what changes on day 15

The trial is the whole product, so it ends on a date rather than feature by feature. Here is exactly what that day changes.

You keep

  • Your account, and every pool, test and dose you saved. Nothing is deleted, and it all stays readable.
  • The dosing calculator — free forever, for anyone, account or no account.

Until you subscribe

  • New dose recommendations stop — poolcntrl stops telling you what to add.
  • Reminders stop arriving. Strip scans, photo diagnoses, the support chat, logging a dose or a service, and adding or editing a pool all wait.

Subscribe whenever you are ready and everything switches back on, exactly where you left it.

What your water needs, worked out from what you measured.

A pool service tells you the water is fine. poolcntrl shows you — every reading, every dose, and what it was measured against.

Pool service
Priced locallyevery month the pool is openRates vary widely between markets, and opening and closing usually cost extra. Compare your own quote.
Doing it yourself
$150–$800a yearChemicals only. It depends on your climate, your pool and your season.
poolcntrl Pro
$49.99a yearTells you exactly what to add, how much, and when.

poolcntrl Pro is $49.99 a year — the one that keeps the other two from being a guess.

Start free for two weeks — no card

Where these figures come from

Where these figures come from. A full-service pool route is priced locally: rates vary widely between markets, it bills every month your pool is open, and opening and closing visits usually cost extra. Your own quote is the number to compare. Doing it yourself costs $150–$800 a year in chemicals, depending on your climate, your pool and your season. Add your poolcntrl subscription on top of the chemicals; whichever way you go, your own numbers depend on your pool, your climate and how long your season runs.

Close the pool and poolcntrl goes quiet — then wakes up in spring.

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.

Pool open fewer than 9 months a year? Monthly costs less. Subscribe when you open and cancel in your Apple ID settings when you close. Cancelling also stops the app’s spring reminder, so put opening day on your own calendar.

Read the closing & opening checklists →

What you’ll actually buy

The chemicals behind a poolcntrl plan, by the name on the shelf. A plan always says which one, which strength, and how much.

  • Liquid chlorineRaises free chlorine

    Liquid chlorine

    Check the strength on the front and the date on the jug. Liquid chlorine weakens on the shelf, so the freshest case is worth reaching for. The app asks which strength you bought, and the amount it gives you changes with your answer — so tell it the jug you actually own, not the one it assumed.

    How it goes in →
  • Cal-hypoRaises free chlorine (and calcium hardness)

    Cal-hypo

    Look for the words "available chlorine" and the grade beside them. Two bags the same size can differ by more than a tenth of their strength, and the front of the bag rarely leads with it. Bags labelled "shock" that list something other than calcium hypochlorite first are a different chemical doing a different job.

    How it goes in →
  • Muriatic acidLowers pH and alkalinity

    Muriatic acid

    The strength is the thing to check, because the two jugs look almost identical and one is about twice the other. The app asks which you bought and the amount it gives you moves with the answer, so read the front before you answer. If the carton with a handle and a sealed cap costs a little more, it is the one to take.

    How it goes in →
  • Dry acidLowers pH and alkalinity

    Dry acid

    Check the panel says sodium bisulfate and nothing else — some tubs sold as "pH Down" are a blend, and a blend is not what the amount on your plan was worked out for. Otherwise it is the same chemical in every tub, so buy on price per pound.

    How it goes in →
  • Soda ashRaises pH and alkalinity

    Soda ash

    Look for sodium carbonate, not sodium bicarbonate. The two sit beside each other on the shelf, the names differ by three letters, and they do different jobs. Laundry-aisle washing soda is the same chemical and usually cheaper — check it is pure, with no scent or brightener.

    How it goes in →
  • BoraxRaises pH (minimal alkalinity change)

    Borax

    Check the box says borax and nothing else. Anything scented, coloured, or sold as a detergent or booster blend belongs in the laundry, not in the pool.

    How it goes in →
  • Baking sodaRaises alkalinity

    Baking soda

    Confirm the panel says sodium bicarbonate. A tub labelled "alkalinity increaser" in the pool aisle is usually the same chemical at several times the grocery price, so compare the panel rather than the front.

    How it goes in →
  • Calcium chlorideRaises calcium hardness

    Calcium chloride

    Read the percentage on the front, because the two grades are not interchangeable by weight and the bags look alike. Ice-melt pellets are often the same chemical, but only take them if the panel says calcium chloride with no anti-caking agent and no colouring added.

    How it goes in →
  • StabilizerRaises stabilizer (CYA)

    Stabilizer

    Granular is the cheaper form and the one to buy. It dissolves slowly, so it goes in a sock in the skimmer rather than straight into the water — the steps on your plan say how. Nothing takes stabilizer back out except replacing water, so take the smaller bag.

    How it goes in →
  • Pool saltRaises salt

    Pool salt

    Purity is the only thing worth comparing. Additives meant for softeners stain a pool, and yellow or brown crystals mean iron. The right bag says "no additives" somewhere on the front.

    How it goes in →

As an Amazon Associate, poolcntrl earns from qualifying purchases.

“The pool store tests my water for free.”

True, and a good deal. Why poolcntrl is for the other six days →

Ready when you are.

Try the calculator first. When you want poolcntrl to keep your pool, the trial is a tap away.

Neighbours with pools? Refer them. They enter your code when they sign up, and every friend who goes on to subscribe earns you a free month — applied automatically, or held until your next uncovered month if you are already subscribed. Nothing is wasted, and there is no limit.

Download on theApp StoreDownload the app

Billing

Your 2-week free trial needs no card and charges nothing — when it ends, access simply returns to the free calculator unless you subscribe. Subscriptions are purchased inside the app through your App Store account, not on this website. Prices shown are in US dollars; your store may show local pricing and taxes. An App Store subscription also starts with two weeks free, if your Apple ID hasn't used this offer before. Subscriptions renew automatically unless cancelled at least 24 hours before the period ends, and you can cancel any time in your App Store settings.