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I see apps out there that are being used and cost money to subscribe. In reality do you need these apps(ie: key app, camera app) does Tesla have their own app for such functions?
No, you don't really need anything more than what Tesla provides. There are a couple of apps that are free and useful for trip planning, but other than that the Tesla app is just fine.
@andaconda is absolutely right, don't need anything else.
Now, after being bored and just looking up old posts, I found Watch for Tesla app. It's gone up in price since the reviews/videos I've read/seen but it looked like a cool app to have. Now remember, you are "sharing" you credentials (to what degree? I'll let others debate that) I'm fine with it for the convenience of having an app on my watch. You don't know how many times I go out to my car during the work day and forget my iPhone. Now? no big deal, just open the app, wait a few seconds for it to wake the car and I can get in. Is it for everyone? obviously not, but it is cool to have. In essence it can do a lot of things your phone app can do, just on your watch. As an aside, it can also remote start your car for you.
No, you don't really need anything more than what Tesla provides. There are a couple of apps that are free and useful for trip planning, but other than that the Tesla app is just fine.