# PoolCalc vs Pool Shark H2O Pro

The clearest difference is review sentiment: Pool Shark H2O Pro at 100% against PoolCalc's 17%. Pool Shark H2O Pro also leads on rating (4.7 vs 1.0) and in-app purchases (none vs 1). PoolCalc's advantage is update cadence (every 2 months vs every 5 months) and iOS requirement (7.1 vs 12.0). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. PoolCalc sells 1 one-off in-app purchase. Pool Shark H2O Pro asks for nothing beyond the download.

Pool Shark H2O Pro holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Pool Shark H2O Pro has 219 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 17% of PoolCalc's written reviews are positive against 100% of Pool Shark H2O Pro's.

PoolCalc ships an update every 2 months, Pool Shark H2O Pro every 5 months. The most recent releases landed on October 15, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | PoolCalc | Pool Shark H2O Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/poolcalc/id514707093/reviews) | **[4.7 (219 ratings)](https://appshunter.io/ios/app/pool-shark-h2o-pro/id1467944894/reviews)** |
| Number of ratings | 1 | **219** |
| Positive reviews | 16.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 8 MB | 4 MB |
| Requires iOS | **7.1** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Bonham Customs](https://appshunter.io/developer/514707096) | [Pool Shark H2O, Inc.](https://appshunter.io/developer/1143122519) |

## What reviewers say

### PoolCalc

[App page](https://appshunter.io/ios/app/poolcalc/id514707093)

This utility calculates the scaling potential of pool water using the Langelier Saturation Index. It allows users to save and edit readings, locations, and add notes. A paid upgrade offers advanced features for pool professionals.

**Highlights:** Langelier Saturation Index calculation, Save and edit readings, Save and edit locations, Add notes to readings, Quick add readings to locations, Paid upgrade for multiple location routes

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pool Professional Upgrade | $2.99 | one-time |


### Pool Shark H2O Pro

[App page](https://appshunter.io/ios/app/pool-shark-h2o-pro/id1467944894)

This app simplifies pool and spa record-keeping and maintenance with compliant logs. It offers instant water analysis and chemical dosage instructions to reduce liability and maintain clean water.

**Highlights:** Health Department Compliant Logs, Instant Water Analysis, Chemical Dosage Instructions, Bluetooth Integration with LaMotte WaterLink Spin Touch, Automated Testing Reminders, Location-Based Pool Search, Tamper-Proof Electronic Logs

**In-app purchases:** none


## Frequently asked questions

### Is PoolCalc free?

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

### Is Pool Shark H2O Pro free?

Pool Shark H2O Pro is free to download, with no in-app purchases.

### Which has better reviews, PoolCalc or Pool Shark H2O Pro?

Pool Shark H2O Pro is rated higher. PoolCalc averages 1.0 out of 5 from 1 ratings, while Pool Shark H2O Pro averages 4.7 from 219 ratings.

### Do PoolCalc or Pool Shark H2O Pro have ads?

Neither PoolCalc nor Pool Shark H2O Pro shows ads.

### Which is updated more often, PoolCalc or Pool Shark H2O Pro?

PoolCalc ships an update every 2 months, and Pool Shark H2O Pro every 5 months. Most recently, PoolCalc was updated on October 15, 2026 and Pool Shark H2O Pro on October 19, 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.*