# G66W vs Pool Math Calculator

The clearest difference is in-app purchases: G66W at none against Pool Math Calculator's 1. G66W also leads on update cadence (monthly vs every 3 months) and iOS requirement (8.0 vs 18.0). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Pool Math Calculator sells 1 one-off in-app purchase. G66W asks for nothing beyond the download.

G66W ships an update monthly, Pool Math Calculator every 3 months. The most recent releases landed on October 5, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | G66W | Pool Math Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (43 ratings)](https://appshunter.io/ios/app/pool-math-calculator/id6746519942/reviews)** |
| Number of ratings | — | **43** |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Monthly** | Every 3 months |
| Monetization | Free | Free |
| Size | 23 MB | 4 MB |
| Requires iOS | **8.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [春辉 麻](https://appshunter.io/developer/1020525759) | [Sergii Nesterenko](https://appshunter.io/developer/1686841405) |

## What reviewers say

### G66W

[App page](https://appshunter.io/ios/app/g66w/id1388256065)

This smart home security system features a high-definition display and dual Wi-Fi/GSM networks for easy installation. Control is managed via an app, remote, or keypad, with support for numerous wireless zones and accessories. It offers advanced features like voice recording and multiple alarm notification numbers.

**Highlights:** High Definition Colorful TFT Display, Wifi & GSM Dual Network, App/Remote/Keypad Control, 45 Wireless Zones, 10 Seconds Human Voice Recording, Multiple Alarm Numbers, Support Adding Camera

**Features:** macOS Compatibility

**In-app purchases:** none


### Pool Math Calculator

[App page](https://appshunter.io/ios/app/pool-math-calculator/id6746519942)

This app simplifies pool water chemistry by calculating precise chemical dosages for balanced water. It helps estimate the impact of adding various chemicals and determines pool volume from basic measurements. Designed for practical, everyday pool maintenance, it keeps essential information readily accessible.

**Highlights:** Chemical dosing calculations, Water balance targets, Chemical addition effect estimation, Pool volume calculation, Pool settings tracking, CSI target checks

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro | $12.99 | one-time |


## Frequently asked questions

### Is G66W free?

G66W is free to download, with no in-app purchases.

### Is Pool Math Calculator free?

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

### Do G66W or Pool Math Calculator have ads?

Neither G66W nor Pool Math Calculator shows ads.

### Which is updated more often, G66W or Pool Math Calculator?

G66W ships an update monthly, and Pool Math Calculator every 3 months. Most recently, G66W was updated on October 5, 2026 and Pool Math Calculator 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.*