Description of App:
All your movies, TV shows, music, and photo collections, organized and streamed to your big screen through your Apple TV for a beautifully familiar streaming experience.
Free or Paid:
I've not noticed any accessibility issues with the app on the Apple TV.
For Plex to work you will also need to install the Plex server app on your computer. Once it is installed and running, there are many media content channels you can add to it and watch or listen on the Apple TV.