The link opens for me without issues, but just in case this is the Play Store link: https://play.google.com/store/apps/details?id=app.symfonik.music.player
Unfortunately its not FOSS, and it is a paid app with time limited trial.
Navidrome for the server, and its WebUI for the desktop, and Synfonium for Android (https://symfonium.app/) Not using iOS so can’t suggest anything there.
The link opens for me without issues, but just in case this is the Play Store link: https://play.google.com/store/apps/details?id=app.symfonik.music.player
Unfortunately its not FOSS, and it is a paid app with time limited trial.