Poolstead: Pool Calculator

Poolstead is a private pool calculator and water log for the tests and product labels you already use. Save one pool with its volume in litres, cubic metres, US gallons, or Imperial gallons. Add a water test in a few taps, with only the readings you have. Keep chlorine, pH, total alkalinity, calcium hardness, cyanuric acid, salt, temperature, method, date, and notes together when they are useful to you. Calculate an increase from an explicit current and target reading, volume, and product label strength. Poolstead covers available chlorine, salt, cyanuric acid, total alkalinity with sodium bicarbonate, and calcium hardness with calcium chloride. Choose the concentration form, density, purity, or calcium chloride form that matches the label. The estimate always shows its assumptions. A calculation is not a treatment record. Save what you actually added, at the amount and time you choose, with an optional snapshot of the calculation that led to it. Correct, backdate, or delete water tests and treatments later. Review one history and export your own CSV whenever you need it. Poolstead stores records on your device and can use your private iCloud account for your own devices when available. It does not read test strips, prescribe target ranges, calculate pH or acid/base doses, determine whether water is safe, or guarantee a resulting concentration. One pool, all five calculation families, water tests, actual treatment history, CSV export, private iCloud when available, and support are free. A one-time Poolstead Plus purchase unlocks additional pools and local PDF reports. The App Store shows the actual localised price. There is no subscription.