# Pool Operator vs Pool Operator Prep

The clearest difference is update cadence: Pool Operator Prep at every 3 weeks against Pool Operator's every 5 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Pool Operator sells 2 in-app purchases, starting at $9.99 per month and Pool Operator Prep sells 2 in-app purchases, starting at $5.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Pool Operator ships an update every 5 months, Pool Operator Prep every 3 weeks. The most recent releases landed on September 27, 2026 and August 27, 2026 respectively.

## The numbers

| Metric | Pool Operator | Pool Operator Prep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pool-operator-cpo-prep-2026/id6761590441/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 7 MB | 3 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Deeun Inc.](https://appshunter.io/developer/1691824695) | [Hermes Inteligencia Digital Ltda](https://appshunter.io/developer/1896694873) |

## What reviewers say

### Pool Operator

[App page](https://appshunter.io/ios/app/pool-operator-cpo-prep-2026/id6761590441)

This app helps pool operators calculate precise chemical dosages for water balance and understand water chemistry. It also includes a daily operations log, turnover rate calculator, and extensive practice questions and mock exams for CPO certification.

**Highlights:** Precise chemical dosage calculation, Langelier Saturation Index analysis, Turnover Rate Calculator, Daily Pool Operations Log with CSV export, 700+ CPO practice questions with explanations, Full mock CPO exam simulation

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pool Operator Pro Monthly | $9.99 | per month |
| Pool Operator Pro Lifetime | $24.99 | one-time |


### Pool Operator Prep

[App page](https://appshunter.io/ios/app/pool-operator-prep-cpo-and-test/id6789195587)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pool Operator Prep Weekly | $5.99 | per 7 days |
| Pool Operator Prep Monthly | $14.99 | per month |


## Frequently asked questions

### Is Pool Operator free?

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

### Is Pool Operator Prep free?

Pool Operator Prep is free to download, with in-app purchases available.

### Do Pool Operator or Pool Operator Prep have ads?

Neither Pool Operator nor Pool Operator Prep shows ads.

### Which is updated more often, Pool Operator or Pool Operator Prep?

Pool Operator ships an update every 5 months, and Pool Operator Prep every 3 weeks. Most recently, Pool Operator was updated on September 27, 2026 and Pool Operator Prep on August 27, 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.*