# Key vs Zip Key

The clearest difference is update cadence: Key at every 4 months against Zip Key's every 9 months. Zip Key's advantage is iOS requirement (12.0 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.

Key ships an update every 4 months, Zip Key every 9 months. The most recent releases landed on October 2, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Key | Zip Key |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 9 months |
| Monetization | Free | — |
| Size | 18 MB | 30 MB |
| Requires iOS | 17.0 | **12.0** |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Interflex Datensysteme GmbH](https://appshunter.io/developer/1150331434) | [StreamNow](https://appshunter.io/developer/1038247999) |

## 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


### Zip Key

[App page](https://appshunter.io/ios/app/zip-key/id1605551482)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Key free?

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

### Is Zip Key free?

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

### Do Key or Zip Key have ads?

Neither Key nor Zip Key shows ads.

### Which is updated more often, Key or Zip Key?

Key ships an update every 4 months, and Zip Key every 9 months. Most recently, Key was updated on October 2, 2026 and Zip Key on October 3, 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.*