No cloud service needed. Your data are stored locally.
Download v1.0.0 for macOSThe app stores the location data of your devices and items (iPhones, iPads, MacBooks, AirTags, AirPods, ...) that are displayed in the official Find My app. These devices and items are typically connected to your iCloud account.
The Find My Logger app reads a cache file generated by the official Find My app, which is periodically updated when the Find My app is open. The Find My Logger app reads this file to obtain the device list, items, and location data from it and then displays them in the app. This is also why it is necessary to ensure that the Find My app remains open.
No, this app does not require any kind of account. It primarily operates offline since it reads location data from the Find My cache. An internet connection is necessary for displaying map data.
The app requires this permission to access the Find My cache file.