GoKawiilNew tool UnknownAuto lets sideloaded apps run on Android Auto for free
A Reddit user known as u/mannumaster built a free, open-source tool called UnknownAuto that tricks Android Auto into accepting sideloaded apps by marking them as installed from Google Play. The tool was created after the developer hit roadblocks trying to run their own self-built app on Android Auto, which normally blocks apps not sourced from the Play Store.