# Clex Key — Türöffnungsapp

> Smartphone-based access control for electronic locking units via Bluetooth. (iPhone/iPad app by Uhlmann & Zacher GmbH.)

- Source: https://appshunter.io/ios/app/clex-key/id1500405117 (this page in markdown: same URL + `.md`)
- Developer: [Uhlmann & Zacher GmbH](https://appshunter.io/developer/1413776543)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 16.0 · 17 MB
- Languages: English, French, German, Italian, Spanish
- Released: 2021-05-17
- Data updated: 2026-06-24
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/clex-key/id1500405117/reviews.md

## What is Clex Key?

Welcome to the new Clex Key App 2! Uhlmann & Zacher presents the Clex Key App, which has been developed from scratch. More efficient communication to the locking units, more stable overall behavior and easy-to-use UI as well as better user guidance for invitation / authorization by the administrator characterize the new Clex Key App.

With the Clex Key App, the electronic locking units of Uhlmann & Zacher can be opened and closed using the smartphone. In the process, the smartphone communicates with the locking units via Bluetooth® Low Energy.

High security standards

To ensure the necessary security, you will receive an invitation to set up your Clex Key app from the operator of the locking system by e-mail and also a short message on your phone. Only after confirming both parts of the invitation, your key can be used to open the locking units using your smartphone

Functions:

- Receive mobile keys and unlock doors via Bluetooth®
- Execute block requests for the administrator

## Key features

- Unlock doors via Bluetooth
- Receive mobile keys
- Efficient communication with locking units
- Improved user guidance
- High security standards
- Execute block requests

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/clex-key/id1500405117/reviews.md

### 3/5 — Jetzt noch Apple Home Key Integration

*2023-07-30, version 1.4.7*

Wenn ich jetzt noch den Schlüssel in die Wallet App übertragen könnte und das ganze einfach so öffnen könnte, wäre die App perfekt.
Also bitte Apple HomeKey Integration!!

### 5/5 — Top System - nur teils kompliziert

*2022-11-06, version 1.3.8*

Grundsätzlich bin ich überzeugt, von dem was hier in Franken gefertigt wird! Nur ist - aufgrund der Struktur der ganzen Verbindung auch hier die Einrichtung etwas komplizierter und führt oft zu Problemen aus der Ferne, wenn man als Admin nicht bei seinem gegenüber ist. Die QR-Codes erleichtern schon mal einiges.
Meine Ideen: Trotz des offline-Ansatzes ohne Cloud wäre gerade wenn man in mehreren Schließsystemen beteiligt ist (als öffnende Person) ein Online-Vergabesystem, welches verschlüsselt genau diese Schlüsselübertragung mittels lästigen Links o.ä. vereinfacht cool. Außerdem wäre gut, wenn man einladungen aus der App löschen könnte ;) denn so muss man die ganze App löschen und neu einrichten, nur um eine fehlerhafte Einladung oder ein nicht mehr benötigtes Projekt aus der App zu entfernen.

Ansonsten: Top Produkt, bis auf seltene Verbindungsprobleme (=> rotes Schloss-Symbol) :)

## Frequently asked questions about Clex Key

### How do I get started with Clex Key?

You will receive an invitation via email and a short message on your phone from the operator of the locking system. Confirming both parts of this invitation is necessary to set up your Clex Key app and use your smartphone to open locking units.

### What devices does Clex Key support?

Clex Key is available for iPhone and iPad devices. It utilizes Bluetooth® Low Energy for communication with the locking units.

### Is Clex Key secure?

Yes, Clex Key employs high security standards. Access is granted only after a two-part invitation confirmation, ensuring that only authorized users can operate the locking units.

### How often is Clex Key updated?

The latest version, 2.7.11, was released on May 18, 2026. While the provided data indicates a future update date, typically apps in this category receive regular updates to improve performance and security.

### Can I use Clex Key offline?

The app communicates with locking units via Bluetooth® Low Energy, which requires the smartphone to be in proximity to the locking unit. An active internet connection is not explicitly stated as required for the unlocking function itself, but initial setup and invitation confirmation may require it.

### What is the age rating for Clex Key?

Clex Key has an age rating of 4+, making it suitable for a wide range of users. This indicates that the content is generally considered appropriate for children.

### Does Clex Key have ads?

No, Clex Key does not contain advertisements. The app is free to download and use without any ad interruptions.

### What are the main benefits of the new Clex Key App 2?

The new version offers more efficient communication with locking units, more stable overall behavior, and an easy-to-use UI with better user guidance for invitations and authorizations.

## Version history (last 5 releases)

### 2.7.11 — 2026-05-18

- New legal notice
- Various UI fixes

### 2.7.9 — 2026-03-19

- New Office Mode feature
- Improved help
- Improved performance

### 2.6.6 — 2025-12-01

- Improved scanning behavior
- Improved user guidance
- Improved retrieval of permissions

### 2.5.2 — 2025-07-28

Removed search from ClexPrime projects

Ordering of log entries

Fix for double confirmation for push notification

### 2.4.0 — 2025-07-11

- A version check for new available versions
 - Improvements to confirmations for push notifications
 - Improvements to the code base

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## More apps by Uhlmann & Zacher GmbH

- [Keyng](https://appshunter.io/ios/app/keyng/id1450613501)
- [ClexFWProg](https://appshunter.io/ios/app/clexfwprog/id6470370699)

All apps by Uhlmann & Zacher GmbH: https://appshunter.io/developer/1413776543

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-24.*