Samsung's next smartwatch OS is called One UI Watch and it will be based on Google's Wear OS. Samsung didn't deatil the Galaxy Watch4, but confirmed it will premiere the One UI Watch user experience when it becomes official at an Unpacked event later this summer. Because it's based on Wear OS, One UI Watch will integrate more deeply with Android than Tizen OS did. If you install an app from the Play Store that has a watch app, it will automatically be installed on the watch as well. And there is seamless sync between watch and smartphone, so if you have more than one city in your clock app...
Source: https://www.gsmarena.com/samsungs_take_on_wear_os_is_called_one_ui_watch-news-49783.php
