# UCL App vs Key

The clearest difference is update cadence: Key at every 4 months against UCL App's every 10 months. UCL App's advantage is iOS requirement (8.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

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

UCL App ships an update every 10 months, Key every 4 months. The most recent releases landed on October 3, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | UCL App | Key |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 4 months** |
| Monetization | — | Free |
| Size | 26 MB | 18 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Umwelt Control Labor](https://appshunter.io/developer/1001561277) | [Interflex Datensysteme GmbH](https://appshunter.io/developer/1150331434) |

## What reviewers say

### UCL App

[App page](https://appshunter.io/ios/app/ucl-app/id1001561278)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is UCL App free?

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

### Is Key free?

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

### Do UCL App or Key have ads?

Neither UCL App nor Key shows ads.

### Which is updated more often, UCL App or Key?

UCL App ships an update every 10 months, and Key every 4 months. Most recently, UCL App was updated on October 3, 2026 and Key on October 2, 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.*