PoolDose: Pool & Hot Tub Care

Exactly how much of which chemical to add — for any pool or hot tub, any size. Works completely offline. No account, no ads.

No subscription. Ever. One purchase unlocks everything, forever.

PoolDose tells you exactly how much of which chemical to add — in ounces, cups, or grams — for pools AND hot tubs of any size. Enter your test results, get instant Low/OK/High verdicts and precise doses. Works completely offline. No account. No ads. No camera gimmicks.

• Any volume — 200-gallon hot tubs welcome (no minimums) • Chlorine, salt water (SWG), and bromine — bromine is a first-class citizen • Brand-independent: liquid chlorine/bleach (any %), Cal-Hypo, Dichlor, Trichlor, muriatic acid, dry acid, soda ash, borax, baking soda, calcium chloride, CYA, pool salt, bromine granules, sodium bromide • Split-dose safety caps and retest timers on every recommendation • Test history, dose log, trend charts • Test and maintenance reminders (filter clean, cartridge/mineral change) • oz/lb to g/mL and gallons to liters, °F to °C

Free version: volume calculator, last 7 days of tests, liquid chlorine dosing. One $5.99 purchase unlocks everything else. Forever. That's the whole business model.

Dosing guidance is based on standard, publicly documented pool chemistry. Always follow the safety instructions printed on your chemical containers.