# Pool Math by TroubleFreePool vs Sun Sizer

The clearest difference is iOS requirement: Pool Math by TroubleFreePool at 15.0 against Sun Sizer's 17.0. On price, update cadence, 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 Sun Sizer sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Pool Math by TroubleFreePool ships an update fortnightly, Sun Sizer every 10 days. The most recent releases landed on November 4, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Pool Math by TroubleFreePool | Sun Sizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.6 (287 ratings)](https://appshunter.io/ios/app/pool-math-by-troublefreepool/id1228819359/reviews)** | — |
| Number of ratings | **287** | — |
| Positive reviews | 63.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 10 days** |
| Monetization | Freemium | — |
| Size | 314 MB | 11 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [TroubleFreePool](https://appshunter.io/developer/1228819358) | [Tachena Nhubu](https://appshunter.io/developer/6815006502) |

## 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


### Sun Sizer

[App page](https://appshunter.io/ios/app/sun-sizer/id6815006500)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 14-day Trial | Free | one-time |
| Sun Sizer Pro Premium | $19.99 | one-time |


## Frequently asked questions

### Is Pool Math by TroubleFreePool free?

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

### Is Sun Sizer free?

Sun Sizer is free to download, with in-app purchases available.

### Do Pool Math by TroubleFreePool or Sun Sizer have ads?

Neither Pool Math by TroubleFreePool nor Sun Sizer shows ads.

### Which is updated more often, Pool Math by TroubleFreePool or Sun Sizer?

Pool Math by TroubleFreePool ships an update fortnightly, and Sun Sizer every 10 days. Most recently, Pool Math by TroubleFreePool was updated on November 4, 2026 and Sun Sizer on November 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.*