i vs Messwerk
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
i
Manage your vehicle registration documents digitally and securely. View, update, and share your registration certificate from your device, reducing paperwork and providing easy access to important vehicle data.
- Digital vehicle registration document (DFZ)
- Add DFZ via eID or QR code
- Automatic updates and inspection reminders
- Share registration documents securely
- View vehicle data offline
- Delete DFZ and shared versions
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The digital vehicle registration document (DFZ) is a digital version of the vehicle registration certificate that can be used in the i-Kfz app on your device. With the i-Kfz app, vehicle owners can view, update and, if necessary, share their vehicle registration document (Zulassungsbescheinigung Teil I (ZB I)) anytime, anywhere. This facilitates access to important vehicle data and reduces the amount of paperwork required. The app also offers a secure and user-friendly way to manage vehicle registration certificates digitally. App functions: ADD: Vehicle owners can have a DFZ issued either using the eID function or by scanning a QR code in the app. There are several options for obtaining a QR code: QR codes are provided both on site, during the registration process or on request, as well as when registering online. UPDATE: The validity and current status of the digital vehicle registration document are automatically checked when the app is opened. The i-Kfz app also offers automatic updates, such as reminders of upcoming periodic technical inspections. SHARE: With just a few clicks, the vehicle owner can generate any number of shared versions of a DFZ and share them with third parties via link or QR code for permanent or temporary use. VIEW: With the help of a user-friendly display, you can view your vehicle and owner data at any time, even without an internet connection, and present it during a traffic check or periodic technical inspections, for example. DELETE: You can delete the DFZ and its shared versions in the app yourself. The i-Kfz app is constantly being developed. We welcome feedback in the store or in the app. If you have any questions or suggestions, our support team will be happy to assist you: i-Kfz@support.bdr.de Privacy policy: http://www.kba.de/app-dse_en Accessibility statement: http://www.kba.de/app-bfe-ios_en End User Licence Agreement (EULA): http://www.kba.de/app-eula_en
Messwerk
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Messwerk — the measurement toolbox in your pocket. Six precise tools in one app — led by a full dB noise meter. No subscriptions, no ads, no clutter. SOUND LEVEL / NOISE METER Measure ambient noise and loudness in decibels dB(A) with professional A-weighting, min/max and average (Leq). Pause runs, save them with names, browse your history and export everything as CSV. SPIRIT LEVEL Precise 2D bubble level with degree readout and haptic feedback when level. COMPASS A clean compass rose showing magnetic heading. BAROMETER Air pressure, altitude changes with a reference point, and absolute altitude above sea level. SPEEDOMETER GPS speed with maximum, average and trip distance. STOPWATCH & TIMER A drift-free stopwatch with lap times and a countdown timer up to 24 hours. Every tool is honest about its accuracy and limits. All measurements stay on your device — no data collection, no accounts, no trackers.
Screenshots
Verdict
The clearest difference is update cadence: Messwerk at monthly against i's every 4 months. On price, ads, in-app purchases and device support 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.
i ships an update every 4 months, Messwerk monthly. The most recent releases landed on October 25, 2026 and October 12, 2026 respectively.
| Parameter | i | Messwerk |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 4 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 67 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Kraftfahrt-Bundesamt | Jan Eggers |
In-app purchases
i
No in-app purchases
Messwerk
No in-app purchases









