# Pool Math by TroubleFreePool vs Impro Countdown Timer

The clearest difference is in-app purchases: Impro Countdown Timer at none against Pool Math by TroubleFreePool's 1. Impro Countdown Timer also leads on iOS requirement (11.0 vs 15.0). Pool Math by TroubleFreePool's advantage is update cadence (fortnightly vs every 8 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. Impro Countdown Timer asks for nothing beyond the download.

Pool Math by TroubleFreePool ships an update fortnightly, Impro Countdown Timer every 8 months. The most recent releases landed on September 22, 2026 and December 3, 2025 respectively.

## The numbers

| Metric | Pool Math by TroubleFreePool | Impro Countdown Timer |
| --- | --- | --- |
| 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 | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 8 months |
| Monetization | Freemium | — |
| Size | 314 MB | 24 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TroubleFreePool](https://appshunter.io/developer/1228819358) | [Impro Suisse Sàrl](https://appshunter.io/developer/1603656575) |

## 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


### Impro Countdown Timer

[App page](https://appshunter.io/ios/app/impro-countdown-timer/id1619153024)

**Features:** macOS Compatibility

**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 Impro Countdown Timer free?

Impro Countdown Timer is free to download, with no in-app purchases.

### Do Pool Math by TroubleFreePool or Impro Countdown Timer have ads?

Neither Pool Math by TroubleFreePool nor Impro Countdown Timer shows ads.

### Which is updated more often, Pool Math by TroubleFreePool or Impro Countdown Timer?

Pool Math by TroubleFreePool ships an update fortnightly, and Impro Countdown Timer every 8 months. Most recently, Pool Math by TroubleFreePool was updated on September 22, 2026 and Impro Countdown Timer on December 3, 2025.

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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.*