Plashy: Pool Calculator & Log

Plashy turns your pool test results into a clear plan. Enter your readings, see what is in range and what is not, then follow dosing steps in the order to add them, in the units you use (gallons, fl oz and lb, or liters, mL and kg). Every test is saved on your phone, and your history is never locked.

No account. Works offline. Free.

WHAT YOU CAN DO

Add your pools
Set up each pool once with a size wizard (rectangle, round, oval, kidney or free form, or type in the volume). Each pool keeps its own log. Switch between imperial and metric any time.

Log a test in seconds
Free chlorine, pH, alkalinity, calcium hardness, stabilizer (CYA) and water temperature. Optional combined chlorine, salt and notes. Your last values show beside each field.

See what is off at a glance
Each reading sits on a waterline bar with the target range marked and a plain label: Low, High or In range. Status never relies on color alone.

Get a dosing plan
Plashy builds an ordered plan from your latest test: which product, how much, when to add it, and how long to wait before the next step. Each step shows what it changes (for example, how an acid addition lowers alkalinity or how a chlorine type affects stabilizer), and the plan shows water balance before and after. If stabilizer is too high, it tells you that the fix is replacing water.

Check water balance
A gauge for the Langelier Saturation Index (LSI) with the alkalinity correction for stabilizer, plus quick what-ifs such as lowering pH or raising calcium before you add anything.

Unlimited test history, free
A chart for every reading with target bands. View 7 days, 30 days, 1 year or all time. Nothing is hidden, capped or locked behind a subscription.

Reminders
Weekly tests, a retest after dosing, monthly calcium and stabilizer checks and a salt cell check. Reminders are scheduled on your device and can arrive a few minutes late.

Your products, your targets
Choose your chlorine type and strength, acid strength, calcium chloride purity and pool surface. Adjust target ranges to match your pool.

SAFETY FIRST

Every dosing plan includes safety notes: never mix chemicals, add chemicals to water and not water to chemicals, keep acid and chlorine apart, wear goggles and gloves. Always follow product labels. If a label differs from what Plashy shows, follow the label.

PRIVATE BY DESIGN

Your pools and tests stay on your device. There is no sign-up and no server of ours. Plashy contains ads from Google AdMob. Ads never appear on the screens where you enter test results, and a consent form (Google's User Messaging Platform) lets you choose your ad settings where required. Privacy policy: https://elosananto.my.id/plashy/privacy.html

IMPORTANT

Plashy is an information tool. It gives estimates based on the numbers you enter and on published pool chemistry guidance. It is not professional advice. Test kits, products, pool surfaces and conditions vary. Always follow the directions on each product label, never mix chemicals, and ask a pool professional if you are unsure. Plashy is not affiliated with any chemical, equipment or pool brand.

Made by Ekalaya Technology. Questions and feedback: [email protected]