You could just name the vehicle with a nickname and also have the color, make, and model. I figure most people don't even know their license plate number from m

You could just name the vehicle with a nickname and also have the color, make, and model. I figure most people don't even know their license plate number from memory. The app could let you "lookup" an existing entry from the license plate since it would then just be checking if the entered plate value matches one of the existing hash values. I guess the part that would be weird is if your license plate # changed but you kept the same vehicle. e.g kid driver their 'parents' car but one year registers it under their own name.