I rode in a 1948 Oldsmobile three days ago. No app needed. At this point the ignition switch is so worn the key is actually optional.
Unless you somehow aren't kidding, in which I'll clarify: I'm skeptical that a modern electric vehicle that goes to the trouble of being a computer on wheels can work without an app. And I'll even clarify "can" - the car manufacturer allows you to operate the car without using its app.