# Chemtrol Web Server vs OPRA Events

The clearest difference is device support: OPRA Events at 3 against Chemtrol Web Server's —. On price, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Chemtrol Web Server | OPRA Events |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.5 (4 ratings)](https://appshunter.io/ios/app/chemtrol-web-server/id6480072740/reviews)** | — |
| Number of ratings | **4** | — |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | Every 2 months | — |
| Monetization | Free | — |
| Size | 1 MB | 51 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Santa Barbara Control Systems Inc](https://appshunter.io/developer/960387757) | [ESX Inc.](https://appshunter.io/developer/1184995557) |

## What reviewers say

### Chemtrol Web Server

[App page](https://appshunter.io/ios/app/chemtrol-web-server/id6480072740)

Access and manage your Chemtrol pool, spa, or cooling tower controller remotely. Monitor real-time readings, adjust settings, and download historical data for comprehensive control.

**Highlights:** Remote monitoring, Setting modification, Data download, Controller management, Pool and spa control

**In-app purchases:** none


### OPRA Events

[App page](https://appshunter.io/ios/app/opra-events/id6754333278)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Chemtrol Web Server free?

Chemtrol Web Server is free to download, with no in-app purchases.

### Is OPRA Events free?

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

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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.*