Clear pool water, without the guesswork

Scan any brand’s test strip or type your numbers, and get exact amounts of the chemicals you already own. For pools and hot tubs.

The iPhone app is coming soon to the App Store. Everything below works here, free, right now.

Any strip, any brand

Hold the strip next to its bottle and take one photo. The app reads it against that bottle’s own colors.

Doses from what you own

Tell it the chemicals on your shelf. It says exactly how much of each to add, in a safe order.

Pools and hot tubs

Chlorine, salt and bromine. Typed tests and drop kits work too, for free.

How it works

1

Dip a strip, or use your drop kit

2

Scan it, or type what you see

3

Add exactly what the app says

The product label always wins. Photos never leave your phone.

Free pool calculators

Pool & hot tub calculators

Free, no sign-up. Exact amounts for your water.

Salt pool calculator

How much pool salt to add for your salt chlorine generator.

Pool chemical calculator

Type your test results and see everything to add, in a safe order.

Pool shock calculator

How much chlorine it takes to shock your pool, from your stabilizer level.

Pool chlorine calculator

How much liquid chlorine, bleach or granules to raise free chlorine.

Hot tub chemical calculator

Test results in, exact spa doses out — chlorine or bromine.

Pool volume calculator

How many gallons your pool holds, from its length, width and depth.

How much acid to lower pH, or pH Up to raise it.

Alkalinity calculator

How much baking soda raises alkalinity — or acid to lower it.

Calcium hardness calculator

How much calcium chloride raises calcium hardness.

Stabilizer calculator

How much stabilizer (cyanuric acid) to add, and when to stop.

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