# Soak: Hot Tub & Spa Calc — Clean water, no guesswork

> Hot tub chemistry assistant for precise chemical dosing and water maintenance. (iPhone/iPad app by Roman Kopaliani.)

- Source: https://appshunter.io/ios/app/soak-hot-tub-and-spa-calc/id6775030424 (this page in markdown: same URL + `.md`)
- Developer: [Roman Kopaliani](https://appshunter.io/developer/1635315269)
- Category: Utilities, Lifestyle
- Price: Free with in-app purchases (on sale, was $3.99)
- Rating: 5.00/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: English, French, German, Italian, Japanese, Spanish
- Released: 2026-06-03
- Data updated: 2026-08-22
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/soak-hot-tub-and-spa-calc/id6775030424/reviews.md

## What is Soak?

Pay once. No subscription, no ads, no account. Works offline.

Soak is the iOS hot tub chemistry assistant. Enter your test readings — free chlorine or bromine, pH, alkalinity, calcium — and get exact doses scaled to your tub volume. Brand-aware: pick the chlorine product on your shelf and Soak does the math.

Features
• Brand-aware dose math for Cal-hypo 68%, Dichlor 56%, Liquid chlorine 12.5%
• Bromine and chlorine sanitizer support, with sanitizer-specific target ranges
• Test & Adjust: enter readings, get exact doses + plain-English advisories
• After-Use Dose: scale top-up by people × hours in the tub
• Weekly Shock guide with chlorine and non-chlorine (MPS) paths
• Locale-aware metric/imperial units (grams/ml or oz/fl oz)
• pH lowerer pick: dry acid or muriatic acid (31.45%)
• Out-of-range advisories so a broken test kit doesn't dose you wrong
• Universal app for iPhone and iPad

For hot tub owners who don't want to download a sales pitch. Bromine or chlorine, 250–500 gallon home spas, 950–1900 liter European tubs.

$3.99 one-time. No subscription, no ads, no account, no cloud.

Privacy: Soak collects nothing. No analytics, no accounts, no network requests. Your settings live on your device.

## Key features

- Brand-aware chemical dose calculations
- Bromine and chlorine sanitizer support
- Exact dose recommendations with advisories
- After-use dose scaling
- Weekly shock guide
- Metric/imperial unit support

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Soak Pro (lifetime) | $6.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/soak-hot-tub-and-spa-calc/id6775030424/reviews.md

### 5/5 — Ok, could be cheaper

*2026-07-03*

walks you through the balance thing without making you feel dumb

### 5/5 — Yep

*2026-07-01*

plug in the numbers, it tells you what to add. that's it. that's the app. love it

## Frequently asked questions about Soak

### What is the price of Soak?

Soak is available for a one-time purchase of $3.99. There are no subscriptions, ads, or in-app purchases required to use its full functionality.

### Does Soak have ads?

No, Soak is completely ad-free. The app is designed to provide a clean user experience without any advertisements.

### What devices does Soak support?

Soak is a universal app that supports both iPhone and iPad devices. It is designed to work seamlessly across Apple's mobile platforms.

### How often is Soak updated?

The latest version of Soak was released on June 23, 2026, indicating recent development activity. Users can expect ongoing support and potential updates.

### Is Soak suitable for all hot tub sizes?

Soak is designed for home spas ranging from 250–500 gallons (950–1900 liters). It provides scaled doses specific to these common hot tub volumes.

### Does Soak require an internet connection?

No, Soak works offline. This means you can use it to manage your hot tub chemistry even without an internet connection, ensuring convenience.

### What information does Soak collect about users?

Soak collects absolutely no user data. It does not use analytics, require accounts, or make network requests, ensuring complete user privacy.

### What is the age rating for Soak?

Soak has an age rating of 4+. This indicates it is suitable for users of all ages and does not contain any mature content.

## Version history (last 4 releases)

### 1.3 — 2026-06-27

You can now unlock Soak Pro at any time from Settings, without waiting for the trial to end. Plus small reliability improvements.

### 1.2 — 2026-06-23

Soak is now free to try — use every feature free for 48 hours, then unlock forever with one simple purchase (no subscription, no ads).

Also now available in German, Spanish, French, Italian, and Japanese.

### 1.1 — 2026-06-05

Quality-of-life tweaks to Test & Adjust:
  • Tap anywhere on a row to enter your reading.
  • Tap outside a row to dismiss the keyboard.

### 1.0 — 2026-06-03

No release notes.

## More apps by Roman Kopaliani

- [Frost: Cold Plunge Care](https://appshunter.io/ios/app/frost-cold-plunge-care/id6776702484)
- [Reef: Aquarium Chemistry Calc](https://appshunter.io/ios/app/reef-aquarium-chemistry-calc/id6776750986)
- [Pond: Koi Chemistry](https://appshunter.io/ios/app/pond-koi-chemistry/id6777459595)
- [Watt: Solar for Van & RV](https://appshunter.io/ios/app/watt-solar-for-van-and-rv/id6777471058)
- [Saline: Saltwater Pool Calc](https://appshunter.io/ios/app/saline-saltwater-pool-calc/id6777715538)

All apps by Roman Kopaliani: https://appshunter.io/developer/1635315269

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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 2026-08-22.*