It's built in to the Tesla's on-board navigation. It's not a separate app. The interface on a Tesla shows a big map and it displays Supercharger locations on th

It's built in to the Tesla's on-board navigation. It's not a separate app. The interface on a Tesla shows a big map and it displays Supercharger locations on the map when your range is inadequate or you can also manually show the locations via an icon. It also automatically routes directions to Superchargers if the route doesn't include enough charge to reach the destination.