# Pool Care Calculator — Hot tub & spa water chemistry

> Hot tub & spa water chemistry (iPhone/iPad app by nobutaka kawasaki.)

- Source: https://appshunter.io/ios/app/pool-care-calculator/id6798891051 (this page in markdown: same URL + `.md`)
- Developer: [nobutaka kawasaki](https://appshunter.io/developer/6797384563)
- Category: Lifestyle, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 21 MB
- Languages: American English
- Released: 2026-08-20
- Data updated: 2026-10-04
- User reviews in markdown: https://appshunter.io/ios/app/pool-care-calculator/id6798891051/reviews.md

## What is Pool Care Calculator?

Pool Care tells you exactly how much of which chemical to add — in ounces, cups, grams or millilitres — 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
• Salt chlorinator presets: Hayward AquaRite, Pentair IntelliChlor, AstralPool, Zodiac and MagnaPool — salt and stabilizer targets straight from the manufacturer's manual. Not listed? Type the range from your own manual.
• 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
• "Do this now" — the one thing to fix first, in the right order
• Test history, dose log, trend charts, water balance (LSI)
• Test and maintenance reminders (filter clean, cartridge/mineral change)
• Chemical inventory and CSV export
• oz/lb to g/mL and gallons to liters, °F to °C — US, Australian and metric product names

Every dose calculation is free — every chemical, every pool type, every sanitizer. A one-time purchase unlocks Pool Care Pro: unlimited history, trend charts, reminders, water balance, chemical inventory, CSV export and multiple pools. Try Pro free for 7 days.

Dosing guidance is based on standard, publicly documented pool chemistry and the manufacturers' published manuals. Always follow the safety instructions printed on your chemical containers, and never mix chlorine with acid.


## Version history (last 5 releases)

### 1.1.2 — 2026-10-03

Fixed the share sheet appearing as a small, cut-off box on iOS 26, so exporting your logs as CSV works properly again.

Nothing else has changed — your pools, tests and records are exactly where you left them, and every dosing calculation works the same way.

### 1.1.1 — 2026-09-26

The app is now called Pool Care. Only the name has changed — your pools, tests and records are exactly where you left them, and every dosing calculation works the same way.

Also new: after you log a dose, you may occasionally see a prompt asking you to rate the app on the App Store. It won't appear for your first 3 logged doses, and never more than once every 90 days.

### 1.1.0 — 2026-09-07

Every dose calculation is now free — every chemical, every pool type, every sanitizer. Pool Tick Pro adds unlimited history, trend charts, reminders, water balance, chemical inventory, CSV export and multiple pools, with a 7-day trial.

Also new:
• Salt chlorinator presets (Hayward, Pentair, AstralPool, Zodiac, MagnaPool) — salt and stabilizer targets from the manufacturer's manual, or type your own
• Product market setting: US, Australia/NZ or metric — product names and label strengths you actually see on the shelf
• Chemical inventory, CSV export, water balance (LSI) and "Do this now"

### 1.0.1 — 2026-08-24

PoolDose Pro is now available. Unlock every chemical, salt water and bromine pools and spas, unlimited test history with trend charts, test reminders, and multiple pools.

Also in this update: clearer wording when the store can't be reached.

### 1.0 — 2026-08-20

No release notes.

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## More apps by nobutaka kawasaki

- [FRAME FIT: Progress Photos](https://appshunter.io/ios/app/frame-fit-progress-photos/id6797384560)
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All apps by nobutaka kawasaki: https://appshunter.io/developer/6797384563

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-04.*