Judging by the reviews on the app store, it's at least a 5-buck one-time purchase and not a subscription as well as a worthy purchase. I'll give this a try

Update: it works surprisingly well. I linked it to my Jellyfin server and the music is played very well, even on the go and even if the song quality is lossless. I haven't quite figured out which UI design I prefer, still testing things out, but so far, I might consider a purchase