# WePass NASM CPT vs Pool Operator

The clearest difference is update cadence: WePass NASM CPT at every 11 days against Pool Operator's every 5 months. WePass NASM CPT also leads on iOS requirement (12.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. WePass NASM CPT sells 1 one-off in-app purchase and Pool Operator sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

WePass NASM CPT ships an update every 11 days, Pool Operator every 5 months. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | WePass NASM CPT | Pool Operator |
| --- | --- | --- |
| 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 11 days** | Every 5 months |
| Monetization | — | Free with in-app purchases |
| Size | 77 MB | 7 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [GEEWAX TECHNOLOGY PTE LTD](https://appshunter.io/developer/1673212998) | [Deeun Inc.](https://appshunter.io/developer/1691824695) |

## What reviewers say

### WePass NASM CPT

[App page](https://appshunter.io/ios/app/wepass-nasm-cpt/id6497231302)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WePass NASM CPT Premium (1yr) | $17.99 | one-time |


### 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 |


## Frequently asked questions

### Is WePass NASM CPT free?

WePass NASM CPT is free to download, with in-app purchases available.

### Is Pool Operator free?

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

### Do WePass NASM CPT or Pool Operator have ads?

Neither WePass NASM CPT nor Pool Operator shows ads.

### Which is updated more often, WePass NASM CPT or Pool Operator?

WePass NASM CPT ships an update every 11 days, and Pool Operator every 5 months. Most recently, WePass NASM CPT was updated on November 4, 2026 and Pool Operator on November 5, 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.*