poolcntrl

poolcntrl turns a water test into an exact dose: which product to use, how much to add, in what order, and when to test again.

START FREE — NO ACCOUNT NEEDED

Open the app and tap "Try it free." Enter your pool volume and whatever readings you have, and you get a real dose back — chlorine, pH, alkalinity, stabilizer, calcium hardness, and salt for saltwater pools. No sign-up, no email, nothing stored. It is the same chemistry engine paying subscribers use, and it stays free.

DOSING YOU CAN ACTUALLY MEASURE

• Amounts in real containers — "about half a gallon jug," a number of tabs, cups — instead of decimals of a pound.
• The right order, and the wait time between one chemical and the next.
• Safety limits built in. When readings are implausible or unsafe to act on, the app declines to give a dose and tells you why instead of guessing.
• Deterministic by design: the same readings always produce the same answer. Dosing is calculated by a versioned chemistry engine, never written by AI.

BUILT FOR PEOPLE WHO ARE NEW TO THIS

• Plain-language explanations of every reading, and what happens if you leave it alone.
• Knowledge Base built into the app: how a water test works, what each measurement means, what each chemical does, how to add chemicals safely, what to do afterward, pool types, equipment explained, and closing and opening your pool.
• Sliders and sensible defaults, so you can enter a test without knowing the jargon first.

SAVE A POOL AND IT KEEPS UP WITH YOU (Pro)

• Reminders that arrive on time: when to retest, when a shock is due, when the floater needs tabs, and when the weather is about to change your water. Every category can be turned off on its own.
• Recommendation history with follow-up. Log what you added, and poolcntrl checks your next test to see whether it actually worked. When the water didn't move the way it should have, you get the most likely reasons ranked in plain language.
• Weather-aware guidance — heat waves, heavy rain, and cold-snap and freeze alerts.
• Seasons handled: guided closing and opening checklists, and a nudge when it's time.
• Trends over time for every reading, plus how satisfied you've been with your water.
• Photos attached to a test, chemical and maintenance logs, and more than one pool.

WHO IT'S FOR

• First-time pool owners who want a clear answer instead of a forum thread
• DIY owners tired of trial and error
• Anyone who inherited a pool with the house

SUBSCRIPTION

poolcntrl Pro is free for the first week, then $5.99/month or $49.99/year. Cancel anytime in your Apple ID settings. The free calculator described above needs no subscription and no account, now or later.

poolcntrl is for residential pool owners. Always follow the handling and dosing instructions printed on the product label.

Terms of Use (EULA): https://poolcntrl.com/terms
Privacy Policy: https://poolcntrl.com/privacy