# Bubble Level for iPhone vs Pool Math by TroubleFreePool

The clearest difference is rating: Bubble Level for iPhone at 4.6 against Pool Math by TroubleFreePool's 3.7. Bubble Level for iPhone also leads on ratings volume (112K vs 272) and iOS requirement (13.0 vs 15.0). Pool Math by TroubleFreePool's advantage is ads (none vs shown) and review sentiment (63% vs 35%). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Bubble Level for iPhone sells 8 in-app purchases, starting at $4.99 per 7 days and Pool Math by TroubleFreePool sells 1 in-app purchase, starting at $7.99 per year. Whichever you choose, the download price is not the number that matters.

Bubble Level for iPhone holds the better App Store score, 4.6 against 3.7. That said, the two scores are not equally well evidenced: Bubble Level for iPhone has 112K ratings behind it against 272, so its average is the more settled of the two. Written reviews complicate that: 35% of Bubble Level for iPhone'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.

Bubble Level for iPhone ships an update every 5 weeks, Pool Math by TroubleFreePool fortnightly. The most recent releases landed on September 25, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Bubble Level for iPhone | Pool Math by TroubleFreePool |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (112K ratings)](https://appshunter.io/ios/app/bubble-level-for-iphone/id465613917/reviews)** | [3.7 (272 ratings)](https://appshunter.io/ios/app/pool-math-by-troublefreepool/id1228819359/reviews) |
| Number of ratings | **112K** | 272 |
| Positive reviews | 34.8% of reviews | **63.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 104 MB | 314 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lemondo Apps LLc](https://appshunter.io/developer/1131593451) | [TroubleFreePool](https://appshunter.io/developer/1228819358) |

## What reviewers say

### Bubble Level for iPhone

[App page](https://appshunter.io/ios/app/bubble-level-for-iphone/id465613917)

This app offers a suite of measurement and detection tools, including a bubble level for alignment, angle measurement, surface flatness checks, and metal detection. It also features an AR ruler for distance measurement and an inclinometer for off-road navigation.

**Highlights:** Bubble level for object alignment, Angle measurement, Surface flatness check, Metal and wire detection, AR ruler for distance measurement, Inclinometer for tilt control, Compass

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly subscription | $4.99 | per 7 days |
| Weekly free trial | $4.99 | per 7 days |
| Monthly subscriptions | $5.99 | per month |
| Bubble Level Pro | $5.99 | per month |
| 3 month | $7.99 | per 3 months |
| 1 Year no free trial | $19.99 | per year |
| 1 Year | $19.99 | per year |
| Remove Ads | $0.99 | one-time |

**What reviewers like**

- 🚀 Handy tool
- 👍 Useful features
- 🚀 Accurate readings
- 👍 Reliable for leveling RVs and caravans

**What reviewers complain about**

- 🐛 Inaccurate readings
- 💩 Constant ads disrupting usage
- 🤑 Paywall for full functionality
- 🐛 Ads still present after paid upgrade

**Reported bugs**

- App freezing/crashing
- Ads blocking access to app features
- Inconsistent performance across devices

**Requested features**

- Calibration option
- Improved contrast for outdoor visibility
- Larger font size for readouts
- Plumb line view through camera


### 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 Bubble Level for iPhone free?

Bubble Level for iPhone is free to download, with in-app purchases available.

### Is Pool Math by TroubleFreePool free?

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

### Which has better reviews, Bubble Level for iPhone or Pool Math by TroubleFreePool?

Bubble Level for iPhone is rated higher. Bubble Level for iPhone averages 4.6 out of 5 from 112K ratings, while Pool Math by TroubleFreePool averages 3.7 from 272 ratings.

### Do Bubble Level for iPhone or Pool Math by TroubleFreePool have ads?

Bubble Level for iPhone shows ads; Pool Math by TroubleFreePool does not.

### Which is updated more often, Bubble Level for iPhone or Pool Math by TroubleFreePool?

Bubble Level for iPhone ships an update every 5 weeks, and Pool Math by TroubleFreePool fortnightly. Most recently, Bubble Level for iPhone was updated on September 25, 2026 and Pool Math by TroubleFreePool on September 22, 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.*