https://www.cnet.com/news/googles-iphone-to-android-ar-doodle-experiment-is-now-live-for-you-to-play-with/

Maybe you didn't catch the news at this year's Google I/O conference, but Google's developed a fascinating tool for enabling multiplayer AR on phones called Cloud Anchors, which syncs positions across devices. It even works across iOS and Android.

The Just A Line app already existed on Android, and is a doodling app in AR. But the app just went live on iOS, too, and is Google's first Android-to-iOS AR experiment.