When comparing RadioTray vs Swinsian, the Slant community recommends Swinsian for most people. In the question“What are the best music players for OSX ?” Swinsian is ranked 8th while RadioTray is ranked 15th.
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Pros
Pro Super easy to use
Because it's designed to be extremely minimal, Radio Tray is extremely easy to use. The entire UI consists of a dropdown menu where you can hover over the genre you wish to listen to, and then you can choose a specific radio station to listen to.
Pro Plugins available
You can extend the utility of Radio Tray through plugins.
Pro Works well with huge libraries
Pro .flac support
Pro Very light for the OS
Pro Album art fetching
Pro Smart playlists
Pro Good value for money, paying is common sense
Spotify and others are music on the street and a sore for the eyes.
Pro Clear interface with lists and words!
Pro Playlist view customisation
Pro DSD/DFF file support
Pro Last.fm scrobbling
Pro Can add lyrics
Pro Watches any folders
Cons
Con Not usable for locally stored media
Radio Tray is intended to be a simple way to stream online music. As such, it doesn't work as a music play for locally stored music.
Con Possibly abandoned
The last release (0.7.3) was back in August 2012, and the last commit is listed as January 2015.
Con Stuck on Intel SOC
Needs Rosetta to work on Apple silicon.
Con Expensive
Con No ReplayGain support
Con No dark mode (yet)
Con Cannot export to mp3 devices
Con Inexplicably refuses to play some files
Swinsian won't play ~1/3 of my flacs. Their support says "works for us". Tried rebuilding library etc, nothing worked. Eventually gave up and stopped using it.