4K allows users to personalize their iPhone and Apple Watch with high-quality wallpapers, backgrounds, and watch faces. Users can browse curated collections, trending content, and popular series. They can set backgrounds and watch faces.
The app supports numerous audio formats and organizes music by artist photos, album covers, genres, and folders. It offers an immersive Info View and is fast even with large collections.
Play videos in AV1, MP4, MKV, MOV, TS, WEBM, and other formats. Support 2D, 3D, VR 180°, 360°, and Fisheye content. Stream from UPnP/DLNA servers or SMB shares over Wi-Fi. Control playback with gesture and voice commands.