Pool Otter

Know exactly what to add.

Water Chemistry Calculator

A pool and spa water log for iPhone and iPad. Log your test and it tells you exactly how much to add, using your target ranges and your chemicals.

Coming soon on theApp Store

For iPhone and iPad. 14 days of Pro free; no card needed.

Test it. Log it. Know exactly what to add.

Your targets, not oursStart from a preset (chlorine pool with FC linked to CYA, salt pool, CDC/ANSI, spa or Taylor ranges) and change any number.

Exact doses for your productsChlorine, acid, soda ash, baking soda, calcium, stabilizer and salt, for your volume and your product’s strength. pH doses account for alkalinity, stabilizer, chlorine and borates.

Your test kit, drops to ppmPick it or scan the barcode on the bottle. Drop kits get a drops-to-ppm counter.

Every reading over timeTrend charts with your target band shaded, and test reminders.

The whole story of your waterTests, chemicals, maintenance and notes on one timeline.

Bring your data, keep your dataImport other apps’ CSV test logs; export CSV or a full backup any time. An optional account backs up and syncs. Works offline.

Plans

Basic

$7.99/year

One pool and one spa
Exact doses for your targets and products
Test kit counter, trends and reminders
CSV import and export, backup and sync

Pro 14-day free trial, no card

$24.99/year

Everything in Basic, plus
Unlimited pools and spas

Prices in USD; your local App Store price may differ. The trial needs no card and does not turn into a paid plan on its own. Without a plan, your data stays viewable and exportable.

MADE IN USA

Your pool data stays in the US

Pool Otter is built and supported by Bayou Browns LLC in Niceville, Florida. If you use an account, your data is stored on Amazon Web Services in Ohio (us-east-2). No ads, no tracking SDKs, and we never sell your data.