K vs Carnet 4
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
K
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.
- Bluetooth access control
- Hands-free entry
- Manage visitor credentials
- View door permissions
- Long-range access mode
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The key app K-APP® is the perfect app to easily access your building. It uses Bluetooth® technology and can be considered as an additional or an alternative way to enter your residential or commercial asset. Get rid of your huge keyrings and download the key app K-APP® which will gather in a unique single app your credentials to enter your premises. The key app K-APP® offers several types of credentials for users whether they are visitors, holiday makers, residents or staff. It has been designed to be user-friendly and gives the opportunities to get a long range and hands-free access mode. In the key app K-APP®, you also have the choice to see all your door permissions in one shot or to only display the permitted doors within the Bluetooth® range of your smartphone. K-APP© works only with the readers from the Pulse range by FDI. Visit our website www.fdimatelec.com for more information.
Carnet 4
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In Carnet mobile you can: - check vehicle's curernt location - check route logs - correct odometer or tank - and much more
Screenshots
Verdict
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.
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.
K ships an update every 3 months, Carnet 4 monthly. The most recent releases landed on October 3, 2026 and September 30, 2026 respectively.
| Parameter | K | Carnet 4 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (4 ratings) — better | — |
| Positive reviews | 14.3% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 3 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 77 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | FDI Matelec | FleetCor Deutschland GmbH |
In-app purchases
K
No in-app purchases
Carnet 4
No in-app purchases
