Pure Tuber is a video and music player app that aims to provide a smooth playback experience. It offers features such as a floating video player, background video and music player, and a sleep timer. The app allows users to play videos and MP music in a floating popup window, as well as continue playing videos and music in the background when exiting the app. It also offers a sleep timer function, allowing users to set a timer before going to sleep and automatically turning off the media. Pure Tuber supports videos and music with resolutions ranging from p to K. The app also includes features like intelligent switching of day and night mode themes, no need for additional plug-ins, and the ability to bookmark favorite videos and music. It should be noted that Pure Tuber uses a third-party tube API for its content, and complies with the API Terms of Use. However, due to YouTube's Terms of Use, the app is not able to display videos with the screen locked or allow users to download songs or music. In terms of privacy, specific information about the app's privacy policy is not provided in the given text. However, it is important for users to be cautious when using third-party apps and to review the app's privacy policy and terms of use before installing and using it.