# Pool Math by TroubleFreePool vs Chill

The clearest difference is rating: Chill at 5.0 against Pool Math by TroubleFreePool's 3.7. Chill also leads on in-app purchases (none vs 1). Pool Math by TroubleFreePool's advantage is update cadence (fortnightly vs every 4 months) and ratings volume (272 vs 2). On price, ads and device support there is nothing between them.

Both are free to download. Pool Math by TroubleFreePool sells 1 in-app purchase, starting at $7.99 per year. Chill asks for nothing beyond the download.

Chill holds the better App Store score, 5.0 against 3.7. That said, the two scores are not equally well evidenced: Pool Math by TroubleFreePool has 272 ratings behind it against 2, so its average is the more settled of the two.

Pool Math by TroubleFreePool ships an update fortnightly, Chill every 4 months. The most recent releases landed on October 16, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Pool Math by TroubleFreePool | Chill |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (272 ratings)](https://appshunter.io/ios/app/pool-math-by-troublefreepool/id1228819359/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/chill-cold-plunge-timer/id6449394827/reviews)** |
| Number of ratings | **272** | 2 |
| Positive reviews | 63.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 4 months |
| Monetization | Freemium | **Free** |
| Size | 314 MB | 6 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [TroubleFreePool](https://appshunter.io/developer/1228819358) | [Anda Blandu](https://appshunter.io/developer/1688883018) |

## What reviewers say

### Pool Math by TroubleFreePool

[App page](https://appshunter.io/ios/app/pool-math-by-troublefreepool/id1228819359)

Easily manage your swimming pool's water chemistry by tracking key levels like chlorine and pH. This app calculates the precise amounts of chemicals needed to maintain clear, algae-free water, offering a cost-effective alternative to pool store advice.

**Highlights:** Chemical level calculators (pH, Chlorine, Alkalinity, etc.), Track pool maintenance tasks, Log chemical additions, Weather condition tracking, Chemical addition effect calculations, Bleach price comparison, Data backup and export

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pool Math Premium Subscription | $7.99 | per year |

**What reviewers like**

- 💎 Excellent for maintaining a clean, balanced pool
- 🔍 Comprehensive tracking of test results and chemical additions
- 🧠 Helpful recommendations for chemical adjustments
- ⚙️ Useful features like SLAM mode and timeline
- 🤖 Automatic weather data logging

**What reviewers complain about**

- 🐛 Issues with data syncing and backup
- 🤔 Unintuitive interface and navigation
- 💰 Subscription model and lack of one-time purchase
- 🚫 Limited support for non-chlorine sanitizers and spa-specific options
- 🔄 Bugs with chemical addition logging and target value retention

**Reported bugs**

- Subscription issues and inability to restore purchases
- App crashes and freezes on certain actions
- Incorrect chemical recommendations and calculations
- Disappearing historical data after updates

**Requested features**

- Custom target ranges and alerts
- Ability to log non-standard chemical additions
- Export options for data analysis
- Apple Watch integration
- Improved user guidance and on-boarding


### Chill

[App page](https://appshunter.io/ios/app/chill-cold-plunge-timer/id6449394827)

This app is a dedicated companion for cold plunge sessions, offering precision timing, guided breathing exercises, and rhythmic chimes to enhance your cold immersion experience. It helps optimize your practice for physical recovery, mental clarity, and energy boosts.

**Highlights:** Customizable session durations, Guided box breathing exercise, 30-second interval chimes, 10-second final countdown, Enhances cold immersion benefits

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Pool Math by TroubleFreePool free?

Pool Math by TroubleFreePool is free to download, with in-app purchases available.

### Is Chill free?

Chill is free to download, with no in-app purchases.

### Which has better reviews, Pool Math by TroubleFreePool or Chill?

Chill is rated higher. Pool Math by TroubleFreePool averages 3.7 out of 5 from 272 ratings, while Chill averages 5.0 from 2 ratings.

### Do Pool Math by TroubleFreePool or Chill have ads?

Neither Pool Math by TroubleFreePool nor Chill shows ads.

### Which is updated more often, Pool Math by TroubleFreePool or Chill?

Pool Math by TroubleFreePool ships an update fortnightly, and Chill every 4 months. Most recently, Pool Math by TroubleFreePool was updated on October 16, 2026 and Chill on October 1, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*