# Pool Math by TroubleFreePool vs H2OCHK Hayward

The clearest difference is review sentiment: Pool Math by TroubleFreePool at 63% against H2OCHK Hayward's 18%. Pool Math by TroubleFreePool also leads on rating (3.6 vs 3.0) and ads (none vs shown). H2OCHK Hayward's advantage is in-app purchases (none vs 1) and iOS requirement (13.6 vs 15.0). On price, update cadence 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. H2OCHK Hayward asks for nothing beyond the download.

Pool Math by TroubleFreePool holds the better App Store score, 3.6 against 3.0. That said, the two scores are not equally well evidenced: Pool Math by TroubleFreePool has 287 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 63% of Pool Math by TroubleFreePool's written reviews are positive against 18% of H2OCHK Hayward's.

Pool Math by TroubleFreePool ships an update fortnightly, H2OCHK Hayward monthly. The most recent releases landed on October 29, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Pool Math by TroubleFreePool | H2OCHK Hayward |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.6 (287 ratings)](https://appshunter.io/ios/app/pool-math-by-troublefreepool/id1228819359/reviews)** | [3.0 (4 ratings)](https://appshunter.io/ios/app/h2ochk-hayward/id1367373317/reviews) |
| Number of ratings | **287** | 4 |
| Positive reviews | **63.4% of reviews** | 18.2% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Monthly |
| Monetization | Freemium | **Ad-supported** |
| Size | 314 MB | 17 MB |
| Requires iOS | 15.0 | **13.6** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TroubleFreePool](https://appshunter.io/developer/1228819358) | [Digital Concepts of Missouri, Inc.](https://appshunter.io/developer/1159162920) |

## 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


### H2OCHK Hayward

[App page](https://appshunter.io/ios/app/h2ochk-hayward/id1367373317)

Easily measure key water quality parameters for pools and spas, including pH, chlorine, and alkalinity. Get fast, accurate results and receive personalized chemical dosage recommendations for optimal water balance.

**Highlights:** Measures 5 water quality parameters, Accurate and fast results, Recommends chemical dosages, Supports pool and spa water, Helps achieve perfect water balance

**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 H2OCHK Hayward free?

H2OCHK Hayward is free to download, with no in-app purchases.

### Which has better reviews, Pool Math by TroubleFreePool or H2OCHK Hayward?

Pool Math by TroubleFreePool is rated higher. Pool Math by TroubleFreePool averages 3.6 out of 5 from 287 ratings, while H2OCHK Hayward averages 3.0 from 4 ratings.

### Do Pool Math by TroubleFreePool or H2OCHK Hayward have ads?

H2OCHK Hayward shows ads; Pool Math by TroubleFreePool does not.

### Which is updated more often, Pool Math by TroubleFreePool or H2OCHK Hayward?

Pool Math by TroubleFreePool ships an update fortnightly, and H2OCHK Hayward monthly. Most recently, Pool Math by TroubleFreePool was updated on October 29, 2026 and H2OCHK Hayward on October 10, 2026.

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