Clex Key vs NFC TagKit
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Clex Key
This app allows you to open and close electronic locking units using your smartphone via Bluetooth Low Energy. It ensures high security through a two-part invitation confirmation process. The updated version offers more efficient communication, stable performance, and an improved user interface.
- Unlock doors via Bluetooth
- Receive mobile keys
- Efficient communication with locking units
- Improved user guidance
- High security standards
- Execute block requests
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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
NFC TagKit
This app allows you to read and write data to various types of RFID tags. It can display detailed information about transponders and supports creating and writing NDEF records on MIFARE® DESFire® tags.
- Read transponder information (type, manufacturer, serial number)
- Display NDEF record data (URL, text, contact)
- Read data from MIFARE® DESFire® tags
- Write files and NDEF records on MIFARE® DESFire® tags
- Supports various tag types (MIFARE, Ntag, FeliCa, ISO)
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NFCTagKit is an application for working with RFID tags. It provides such functions as reading different kinds of transponders and writing on MIFARE® DESFire® tags. Activating a reading function of the application displays all necessary information about the transponders: • tag type and manufacturer • technologies • serial number • total memory size • filled data volume • etc. Besides that, there is all the information about NDEF records and all the data on the card for such formats as • URL • text message • contact information • etc. One of the key advantages is reading the data from MIFARE® DESFire® transponders, including applications, files, and keys. Activating a writing function of the app grants the possibility to use the demo of the CoreWillSoft GmbH solution. The users can create and write files on the MIFARE® DESFire® tags and make different types of NDEF records. The NFCTagKit App supports such types of tags, as: • MIFARE® DESFire® EV1 • MIFARE® DESFire® EV2 • MIFARE® Ultralight® • MIFARE® Ultralight® C • MIFARE® Ultralight® EV1 • Ntag 213 • Ntag 215 • ISO15693 • FeliCa • ISO7816 (ISO14443-4 type A / B tag with ISO7816 communication protocol) The full functionality of our solution is available for ordering on the CoreWillSoft GmbH website. We are providing the decisions for all kinds of businesses that use RFID technologies and mobile identification.
Screenshots
Verdict
The clearest difference is review sentiment: NFC TagKit at 100% against Clex Key's 50%. Clex Key's advantage is update cadence (every 2 months vs every 4 months). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Clex Key ships an update every 2 months, NFC TagKit every 4 months. The most recent releases landed on September 21, 2026 and June 10, 2026 respectively.
| Parameter | Clex Key | NFC TagKit |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.0 (1 ratings) — better |
| Positive reviews | 50.0% of reviews | 100.0% of reviews — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 18 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Uhlmann & Zacher GmbH | CoreWillSoft GmbH |
Customer experience
Clex Key
NFC TagKit
In-app purchases
Clex Key
No in-app purchases
NFC TagKit
No in-app purchases









