What each platform is
Apple CarPlay and Android Auto are projection systems: the phone does the computing, the car provides the screen, speakers, microphone and controls. CarPlay works with iPhones; Android Auto with Android phones. Both present a driving-simplified interface — navigation, calls, messages read aloud, and a curated set of media and messaging apps — and both are built around their platform's voice assistant.
Practical differences
The map defaults differ (Apple Maps vs Google Maps, though both platforms now allow the major alternatives). The app catalogues overlap heavily on media and messaging but are not identical. Interface conventions differ in small ways that matter to muscle memory. For a household or a fleet with mixed phones, none of this argues for choosing a side — it argues for hardware that supports both.
What to check in hardware
Head units and adapters increasingly list both platforms, and the listings deserve a careful read: does “CarPlay + Android Auto” mean both wireless, or one wireless and one wired? In the AUROADOR catalogue, the CarPlay adapter listings name CarPlay and Android Auto together in the conversion function — wired factory CarPlay converted to wireless, with both platforms named — while the vehicle-specific head-unit range is described by the brand as built around wireless CarPlay. Treat each product's own documented line as the truth for that product, and confirm the Android Auto behaviour of the exact model when you inquire if your market is Android-dominant.
For sellers
Platform split is a market fact, not a global one: some regions are iPhone-led, others overwhelmingly Android. Stock to your market's split, write listings that state both platforms' support mode (wireless/wired) explicitly, and never let a title imply a platform the product's documentation does not name.