# Imperial Measuring App vs Pool Math by TroubleFreePool

The clearest difference is in-app purchases: Imperial Measuring App at none against Pool Math by TroubleFreePool's 1. Imperial Measuring App also leads on iOS requirement (13.0 vs 15.0). Pool Math by TroubleFreePool's advantage is update cadence (fortnightly vs every 5 months). 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. Imperial Measuring App asks for nothing beyond the download.

Imperial Measuring App ships an update every 5 months, Pool Math by TroubleFreePool fortnightly. Both last shipped on October 20, 2026.

## The numbers

| Metric | Imperial Measuring App | Pool Math by TroubleFreePool |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.7 (272 ratings)](https://appshunter.io/ios/app/pool-math-by-troublefreepool/id1228819359/reviews)** |
| Number of ratings | — | **272** |
| Positive reviews | — | 63.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Fortnightly** |
| Monetization | — | Freemium |
| Size | 19 MB | 314 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Fisherlea Systems](https://appshunter.io/developer/527179203) | [TroubleFreePool](https://appshunter.io/developer/1228819358) |

## What reviewers say

### Imperial Measuring App

[App page](https://appshunter.io/ios/app/imperial-measuring-app/id939806951)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Imperial Measuring App free?

Imperial Measuring App 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.

### Do Imperial Measuring App or Pool Math by TroubleFreePool have ads?

Neither Imperial Measuring App nor Pool Math by TroubleFreePool shows ads.

### Which is updated more often, Imperial Measuring App or Pool Math by TroubleFreePool?

Imperial Measuring App ships an update every 5 months, and Pool Math by TroubleFreePool fortnightly. Most recently, Imperial Measuring App was updated on October 20, 2026 and Pool Math by TroubleFreePool on October 20, 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.*