Hitoshi Cluster is a watch face app designed by Jeweler Broda for Samsung Galaxy Watch 4 powered by Wear OS. The app offers a wide range of customization options, including 6x6x16 theme combinations, battery info, date, weekday, moon phase, step counter, daily step goal percentage, heart rate, 2 custom complications, and 4 app shortcuts (including 1 custom shortcut). It has a simple and user-friendly interface that allows users to change graphics, colors, custom complications, and custom shortcuts by long-pressing on the watch face.

One important note to keep in mind is that the heart rate measuring on the watch face is not synchronized with Samsung S Health, Google Fit, or any other app. It works independently, and to measure your heart rate, you need to put the watch correctly on your wrist, tap the HR measure button on the watch face, and wait for a few seconds until the heart icon blinks and a new HR value appears on the watch face. Additionally, users should make sure they have enabled all permissions for the watch face in settings/applications/permissions.

Overall, Hitoshi Cluster is a great watch face app that offers a wide range of customization options, making it an excellent choice for those who want to personalize their Samsung Galaxy Watch 4.