# Pool Chem Calculator vs Flex Controller

The clearest difference is in-app purchases: Flex Controller at none against Pool Chem Calculator's 1. Flex Controller also leads on ads (none vs shown). Pool Chem Calculator's advantage is update cadence (every 6 days vs every 13 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Pool Chem Calculator sells 1 in-app purchase, starting at $1.99 per month. Flex Controller asks for nothing beyond the download.

Pool Chem Calculator ships an update every 6 days, Flex Controller every 13 months. The most recent releases landed on October 6, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Pool Chem Calculator | Flex Controller |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (36 ratings)](https://appshunter.io/ios/app/pool-chem-calculator/id1453351222/reviews)** | — |
| Number of ratings | **36** | — |
| Positive reviews | 36.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 6 days** | Every 13 months |
| Monetization | Free with in-app purchases | — |
| Size | 113 MB | 31 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Gunter Business Solutions Inc](https://appshunter.io/developer/1453351221) | [Poolsure, a division of Aquasol Controllers, Inc.](https://appshunter.io/developer/1545322313) |

## What reviewers say

### Pool Chem Calculator

[App page](https://appshunter.io/ios/app/pool-chem-calculator/id1453351222)

This app helps manage pool chemistry with 24 specialized calculators for dosing, pH, and more. It features a customizable maintenance calendar, equipment tracking, and easy report sharing for up to 100 pools. Ideal for maintaining a clean and swim-ready pool.

**Highlights:** 24 precision pool chemical calculators, Customizable maintenance calendar with notifications, Equipment tracking and management, Multi-user pool sharing, Professional report builder, Smart pool route mapping

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 100 Pool Subscription | $1.99 | per month |


### Flex Controller

[App page](https://appshunter.io/ios/app/flex-controller/id6741504172)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Pool Chem Calculator free?

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

### Is Flex Controller free?

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

### Do Pool Chem Calculator or Flex Controller have ads?

Pool Chem Calculator shows ads; Flex Controller does not.

### Which is updated more often, Pool Chem Calculator or Flex Controller?

Pool Chem Calculator ships an update every 6 days, and Flex Controller every 13 months. Most recently, Pool Chem Calculator was updated on October 6, 2026 and Flex Controller on October 8, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*