Two drivers, one vehicle logbook. And each driver uses it on his/her smartphone, no matter whether an iPhone or an Android phone. The data are summarized later in a convenient way.
Convenience is important to us also with respect to the operation of the app. You may wish to immediately start and complete the data later. Or, if you prefer, you can fill out everything in advance. You can always reach frequent trips directly, as a template.
The vehicle logbook automatically suggests meaningful data such as the current address or already-known business partners. Of course, you can also take over these data from your contacts.
By the way, this vehicle logbook is just as safe as a written one. Just more comfortable. All data are protected against manipulation. On your device, in the backup, in synchronization, in the PDF file and in the printout. Your tax office can verify the printout without any additional files.
Oh yes, you can of course use AirPrint to print your logbook directly from the iPhone. The printout includes a QR code which confirms the authenticity of the printout by kryptographic means. Testable with each QR code scanner, so with any smartphone.
You do not need any additional software on your PC. Your smartphone will suffice. And if you later switch to a different phone type, your logbook will remain useful.
You have more than one car and further drivers will use it? No problem. You can always add more drivers and manage all of your vehicles with this app.