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Navidrome is a server. You can use it directly by connecting to it in a browser, but its point is to serve the music to a client, of which many exist for both iOS and Android.

Navidrome is a server, not a desktop app. It's more analogous to Plex than Plexamp. If you want a mobile app that can do Subsonic (the protocol Navidrome uses), Symfonium on Android is amazing.

Navidrome is compatible with browser apps through a protocol the name of which eludes me at the moment

The web interface also runs pretty flawlessly on mobile browser. I was actually shocked at how responsive it was.

Subsonic API: https://www.subsonic.org/pages/api.jsp