# Pool Math by TroubleFreePool vs Stain Fix

Pool Math by TroubleFreePool and Stain Fix both sit at 3.7 stars, but that hides the real split: 100% of Stain Fix's written reviews are positive against 63% of Pool Math by TroubleFreePool's. Stain Fix also leads on update cadence (every 2 days vs fortnightly). Pool Math by TroubleFreePool's advantage is ratings volume (272 vs 3). On price, rating, ads and in-app purchases 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 and Stain Fix sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 3.7 for Pool Math by TroubleFreePool against 3.7 for Stain Fix. That said, the two scores are not equally well evidenced: Pool Math by TroubleFreePool has 272 ratings behind it against 3, so its average is the more settled of the two. Written reviews are what separate them: 63% of Pool Math by TroubleFreePool's written reviews are positive against 100% of Stain Fix's.

Pool Math by TroubleFreePool ships an update fortnightly, Stain Fix every 2 days. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Pool Math by TroubleFreePool | Stain Fix |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (272 ratings)](https://appshunter.io/ios/app/pool-math-by-troublefreepool/id1228819359/reviews) | **[3.7 (3 ratings)](https://appshunter.io/ios/app/stain-fix-remove-stains/id6760374116/reviews)** |
| Number of ratings | **272** | 3 |
| Positive reviews | 63.4% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 days** |
| Monetization | Freemium | Free with in-app purchases |
| Size | 314 MB | 79 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TroubleFreePool](https://appshunter.io/developer/1228819358) | [BUILT BY FOUNDRY, INC.](https://appshunter.io/developer/1792457041) |

## 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


### Stain Fix

[App page](https://appshunter.io/ios/app/stain-fix-remove-stains/id6760374116)

Instantly identify and remove tough stains with guided, step-by-step instructions. Simply snap a photo of the mess, confirm the surface, and receive a personalized cleaning plan with timers and product suggestions. Save successful methods for future use.

**Highlights:** Photo stain identification, Step-by-step cleaning plans, Timer-guided cleaning, Product swap suggestions, Surface-specific safety notes, Saved cleaning methods

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $9.99 | per month |
| Annual Premium | $39.99 | per year |


## Frequently asked questions

### Is Pool Math by TroubleFreePool free?

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

### Is Stain Fix free?

Stain Fix is free to download, with in-app purchases available.

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

Stain Fix is rated higher. Pool Math by TroubleFreePool averages 3.7 out of 5 from 272 ratings, while Stain Fix averages 3.7 from 3 ratings.

### Do Pool Math by TroubleFreePool or Stain Fix have ads?

Neither Pool Math by TroubleFreePool nor Stain Fix shows ads.

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

Pool Math by TroubleFreePool ships an update fortnightly, and Stain Fix every 2 days. Most recently, Pool Math by TroubleFreePool was updated on October 16, 2026 and Stain Fix on October 7, 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.*