# BLACK X vs Key Sync™

The clearest difference is device support: BLACK X at 2 against Key Sync™'s —. Key Sync™'s advantage is iOS requirement (11.0 vs 15.0). On price and in-app purchases 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 | BLACK X | Key Sync™ |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | — |
| Update frequency | Monthly | — |
| Monetization | Free | — |
| Size | 47 MB | 67 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | **iPhone, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [BLACK LIMITED UNIPESSOAL LDA](https://appshunter.io/developer/1723970240) | [Michel Sales Company](https://appshunter.io/developer/1883582701) |

## What reviewers say

### BLACK X

[App page](https://appshunter.io/ios/app/black-x/id6475334467)

Control and monitor home access remotely with a smart lock system. Grant and revoke access for guests, receive activity alerts, and integrate with voice assistants for hands-free operation.

**Highlights:** Remote door unlocking, Effortless access sharing, Activity feed monitoring, Customizable smart alerts, Voice command integration, Rental business management

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

**In-app purchases:** none


### Key Sync™

[App page](https://appshunter.io/ios/app/key-sync/id6760275098)

**In-app purchases:** none


## Frequently asked questions

### Is BLACK X free?

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

### Is Key Sync™ free?

Key Sync™ 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.*