AlwaysOn is a personalization app with AMOLED or OLED displays for Android devices. It allows users to have an always-on display with various customization options regarding the watch's face, behavior, and background. The app shows the time, date, battery state, notifications, and more, all in one place. Additionally, users can enable charging and headphones animations that appear when plugging in headphones or charging the device.

AlwaysOn offers a range of features, including multiple watch faces, the ability to view notifications and what you are listening to, edge glow, rules, double tap to wake, pocket mode, do not disturb mode, and more. The app requires minimal permissions, and the source code is available on GitHub. Overall, AlwaysOn is a helpful app for those who want to customize their device's display and have all the important information in one place.