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Sleeve on MacOS, last.fm app on iOS (have to manually check for new scrobbles every so often and it only counts songs from your library) and a web extension scrobbler for when I’m on Linux using the web version.

QuietScrob on iOS/iPadOS works pretty well - it seems any breakage is due to Apple silently changing APIs more than anything on the dev's end.

On Desktop (macOS) I use the official Last.FM app - however it's still a Rosetta 2 app which will be sunset in the fall :(

I wish Apple Music would support scrobbling to the Last.FM API like Spotify, but to get the ball rolling we'd need someone on the Apple Music team who can nudge it up the list.

NepTunes on macOS is nice - and it (optionally) adds the current track info to your menubar.

I haven't found anything reliable for iOS, however.

Marvis Pro!

On desktop devices, I'm using Cider.sh which supports scrobbling, and on Android I use Pano Scrobbler.