# HTH™ | Test to Swim™ vs Pool Math by TroubleFreePool

The clearest difference is rating: HTH™ | Test to Swim™ at 4.7 against Pool Math by TroubleFreePool's 3.6. HTH™ | Test to Swim™ also leads on in-app purchases (none vs 1) and ratings volume (4.2K vs 287). Pool Math by TroubleFreePool's advantage is review sentiment (63% vs 24%) and update cadence (fortnightly vs monthly). On price, ads, monetization model 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. HTH™ | Test to Swim™ asks for nothing beyond the download.

HTH™ | Test to Swim™ holds the better App Store score, 4.7 against 3.6. That said, the two scores are not equally well evidenced: HTH™ | Test to Swim™ has 4.2K ratings behind it against 287, so its average is the more settled of the two. Written reviews complicate that: 24% of HTH™ | Test to Swim™'s written reviews are positive against 63% of Pool Math by TroubleFreePool's, so the app with the better star average is not the one people write more warmly about.

HTH™ | Test to Swim™ ships an update monthly, Pool Math by TroubleFreePool fortnightly. The most recent releases landed on November 6, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | HTH™ | Test to Swim™ | Pool Math by TroubleFreePool |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (4.2K ratings)](https://appshunter.io/ios/app/hth-test-to-swim/id643360256/reviews)** | [3.6 (287 ratings)](https://appshunter.io/ios/app/pool-math-by-troublefreepool/id1228819359/reviews) |
| Number of ratings | **4.2K** | 287 |
| Positive reviews | 23.9% of reviews | **63.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 55 MB | 314 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Solenis, LLC](https://appshunter.io/developer/1677207377) | [TroubleFreePool](https://appshunter.io/developer/1228819358) |

## What reviewers say

### HTH™ | Test to Swim™

[App page](https://appshunter.io/ios/app/hth-test-to-swim/id643360256)

This app helps pool and spa owners maintain water quality by analyzing test strip results. It provides instant recommendations, step-by-step instructions, and access to helpful resources for clear and balanced water.

**Highlights:** Scan test strips with Google Cloud Vision, Interactive spa test strip matching, Instant water balance recommendations, Save test history, Pool and spa care resource library, Retail product locator

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Easy to use
- 👍 Helpful guidance
- 💡 Tracks water testing history

**What reviewers complain about**

- 🐛 Inconsistent and inaccurate results
- 🤖 Poor camera/scanning functionality
- 🤔 Requires too much personal information
- 🚫 Doesn't work for all pool types

**Reported bugs**

- Registration and login issues
- Crashing and freezing
- Incompatible with certain devices

**Requested features**

- Ability to manually enter test results
- More customization for pool size/type
- Improved accuracy and consistency


### 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


## Frequently asked questions

### Is HTH™ | Test to Swim™ free?

HTH™ | Test to Swim™ is free to download, with no in-app purchases.

### Is Pool Math by TroubleFreePool free?

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

### Which has better reviews, HTH™ | Test to Swim™ or Pool Math by TroubleFreePool?

HTH™ | Test to Swim™ is rated higher. HTH™ | Test to Swim™ averages 4.7 out of 5 from 4.2K ratings, while Pool Math by TroubleFreePool averages 3.6 from 287 ratings.

### Do HTH™ | Test to Swim™ or Pool Math by TroubleFreePool have ads?

Neither HTH™ | Test to Swim™ nor Pool Math by TroubleFreePool shows ads.

### Which is updated more often, HTH™ | Test to Swim™ or Pool Math by TroubleFreePool?

HTH™ | Test to Swim™ ships an update monthly, and Pool Math by TroubleFreePool fortnightly. Most recently, HTH™ | Test to Swim™ was updated on November 6, 2026 and Pool Math by TroubleFreePool on November 4, 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.*