# Key vs NFC TagKit

The clearest difference is iOS requirement: NFC TagKit at 15.6 against Key's 17.0. On price, review sentiment, update cadence and ads there is nothing between them.

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

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on September 14, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Key | NFC TagKit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/nfc-tagkit/id1593858521/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Free | Free |
| Size | 18 MB | 8 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Interflex Datensysteme GmbH](https://appshunter.io/developer/1150331434) | [CoreWillSoft GmbH](https://appshunter.io/developer/1593858523) |

## What reviewers say

### Key

[App page](https://appshunter.io/ios/app/key/id1150331435)

Transform your iPhone into a mobile ID card for convenient door access. Securely register your credentials and use your phone to open doors, leveraging advanced encrypted transfer technology.

**Highlights:** Smartphone as mobile ID, Convenient door opening, Secure credential transfer, iPhone integration, Requires Interflex software

**In-app purchases:** none


### NFC TagKit

[App page](https://appshunter.io/ios/app/nfc-tagkit/id1593858521)

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.

**Highlights:** 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)

**In-app purchases:** none


## Frequently asked questions

### Is Key free?

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

### Is NFC TagKit free?

NFC TagKit is free to download, with no in-app purchases.

### Do Key or NFC TagKit have ads?

Neither Key nor NFC TagKit shows ads.

### Which is updated more often, Key or NFC TagKit?

Key ships an update every 4 months, and NFC TagKit every 4 months. Most recently, Key was updated on September 14, 2026 and NFC TagKit on September 19, 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.*