# K vs Carnet 4

The clearest difference is update cadence: Carnet 4 at monthly against K's every 3 months. Carnet 4 also leads on device support (3 vs 1) and iOS requirement (15.1 vs 18.6). On price, ads and in-app purchases there is nothing between them.

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

K ships an update every 3 months, Carnet 4 monthly. The most recent releases landed on October 3, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | K | Carnet 4 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/k-app/id1472380768/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 14.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free | — |
| Size | 77 MB | 43 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [FDI Matelec](https://appshunter.io/developer/1173507412) | [FleetCor Deutschland GmbH](https://appshunter.io/developer/1090470381) |

## What reviewers say

### K

[App page](https://appshunter.io/ios/app/k-app/id1472380768)

This application provides a secure and convenient way to access your building using your smartphone. It offers hands-free entry and allows you to manage multiple access credentials for residents, visitors, or staff.

**Highlights:** Bluetooth access control, Hands-free entry, Manage visitor credentials, View door permissions, Long-range access mode

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Carnet 4

[App page](https://appshunter.io/ios/app/carnet-4/id1584794808)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is K free?

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

### Is Carnet 4 free?

Carnet 4 is free to download, with no in-app purchases.

### Do K or Carnet 4 have ads?

Neither K nor Carnet 4 shows ads.

### Which is updated more often, K or Carnet 4?

K ships an update every 3 months, and Carnet 4 monthly. Most recently, K was updated on October 3, 2026 and Carnet 4 on September 30, 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.*