The Pool Chemistry App That Tells You Exactly What to Add

What a good pool chemistry app should do

Most pool apps stop at telling you a reading is high or low. You already knew that from the test strip. The useful part is what comes next: which chemical, how much, in what order, and how long to wait between additions.

Pool Clarity covers all six core parameters: free chlorine, pH, total alkalinity, calcium hardness, cyanuric acid, and salt level for saltwater pools. Enter whichever readings your kit measures and the app analyzes each one against the ideal range for your pool type.

Then it builds your plan. If alkalinity and pH are both off, it tells you to fix alkalinity first, because adjusting it changes your pH. That ordering alone saves most pool owners weeks of chasing numbers.

Built for your specific pool

A 12,000 gallon saltwater pool in Florida needs different care than a 25,000 gallon chlorine pool in Ohio. During setup you enter your pool volume, sanitizer type, environment, and state. Every dose and every tip is calculated from that profile.

Saltwater pool? The app recommends adjusting your salt cell output before adding chemicals, because that is usually the cheaper and easier fix. Using trichlor tabs? It warns you when your stabilizer is creeping up, since tabs add CYA with every use.

The app also saves every reading forever, free. Trend charts show you how each parameter has moved over your last 10 tests, so you can spot patterns like chlorine always crashing after rain.

Really free, and here is how

No subscription, no premium tier, no ads. When the app recommends a chemical, it includes an optional Amazon link. If you buy through it, we earn a small commission at no cost to you. That is the whole business model.

Everything is included: unlimited history, trend charts, weekly test reminders, a personalized maintenance schedule, a service report card, and a DIY cost tracker.

Works with any test kit

Test strips, liquid drop kits, digital readers, or the printout from a pool store test. If it gives you numbers, Pool Clarity can use them. Not sure which kit to get? Our water testing guide compares strips and drop kits.