Most media apps keep your library on their servers and show you a view of it. Vibio does the opposite: what you save is stored on the device you saved it on. That one decision explains most of how the app behaves.
What you get
Your library opens and plays with no connection, because nothing has to be fetched to read it. There is no account to create, nothing to sign in to, and no subscription. And there is no copy of what you listen to sitting in an account somewhere, because there is no account.
Several people, one device
Each profile on a device gets its own library, its own playlists and its own settings. A shared phone does not mean a shared library.
A secret folder
Anything you would rather not see in the main library can be moved behind a lock, and it stays out of the places media normally surfaces.
What it costs, honestly
Local-first has a real downside: a library that lives on one device does not appear on another by itself. So Vibio gives you the manual version instead of pretending otherwise. You can export your library, and you can move it to another device by scanning a code.