# REX Centrum bezpečí vs Sx3App

The clearest difference is price: REX Centrum bezpečí at Free against Sx3App's $9.99. REX Centrum bezpečí also leads on device support (3 vs 1) and iOS requirement (11.0 vs 17.6). On update cadence, ads and in-app purchases there is nothing between them.

REX Centrum bezpečí is free to download; Sx3App costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 7, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | REX Centrum bezpečí | Sx3App |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free | — |
| Size | 19 MB | 1 MB |
| Requires iOS | **11.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [1. REX SERVICES, a.s.](https://appshunter.io/developer/1084232045) | [Emtron s.r.o](https://appshunter.io/developer/1453715625) |

## What reviewers say

### REX Centrum bezpečí

[App page](https://appshunter.io/ios/app/rex-centrum-bezpeci/id1530005571)

Manage all your REX devices from a single mobile application. Control security systems, track vehicles and pets, and view event history. Sign in with your REX account to access all features.

**Highlights:** Arm and disarm controls, Map view, Logbook and event history, Device and contact settings, Billing and payment, Support for various REX devices

**Features:** macOS Compatibility

**In-app purchases:** none


### Sx3App

[App page](https://appshunter.io/ios/app/sx3app/id6467041210)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is REX Centrum bezpečí free?

REX Centrum bezpečí is free to download, with no in-app purchases.

### Is Sx3App free?

Sx3App costs $9.99, with no in-app purchases.

### Do REX Centrum bezpečí or Sx3App have ads?

Neither REX Centrum bezpečí nor Sx3App shows ads.

### Which is updated more often, REX Centrum bezpečí or Sx3App?

REX Centrum bezpečí ships an update every 3 months, and Sx3App every 3 months. Most recently, REX Centrum bezpečí was updated on October 7, 2026 and Sx3App on October 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.*