Ultrasonic is a Subsonic client for Android that allows you to connect to your Subsonic server and stream music. This app is known for its speed and thin design, making it a great choice for those who want a fast and lightweight option for their music streaming needs.

One of the most impressive features of Ultrasonic is its support for multiple servers, making it easy to switch between different Subsonic servers. The app also has an offline mode, which lets you listen to your music even when you don't have an internet connection.

Ultrasonic also has a variety of customization options, including dark and light themes, bookmarks, and the ability to create playlists on the server. Additionally, the app offers random play, jukebox mode, and even a server chat feature.

Overall, Ultrasonic is a great option for those who want a fast and reliable Subsonic client for their Android device. The app is available for free and the source code is available on GitLab under the GPL license. If you encounter any issues with the app, the developer has provided a dedicated issue tracker on GitLab for users to report bugs and suggest improvements.