Shuttle+ Music Player vs Musicolet Music Player

Shuttle+ Music Player can auto find and display the lyrics to songs.

Gapless playback is built in to the app.

There are multiple themes to choose from including black, white and blue themes.

There is an included sleep timer built into the app.

There are 2x1, 4x1, 4x2, and 4x4 widgets available to use that are color customizable.

There is a free version available for users to download.

There are included notification controls where the user can pause, play and change tracks from the notification pull down.

There are included lockscreen controls where the user can pause, play and change tracks from the lockscreen.

You can optionally support the developer and pay for pro features, but the free version isn't missing any core features.

Intuitive options to decide what to do when song or "queue" ends.

Supports many audio formats natively, as well as all formats supported by the system decoder of the Android device in use.

The app doesn't include the Internet permission, so no user data can be sent to the app author.

You can multi-select songs to add to a playlist, and you can use your finger to drag one or multiple songs to the desired position in the playlist, for example. There is also a command to insert a selection of songs into the current playlist after the current song.

Also allows saving unlimited playlists for later use, and playlists can be exported as external .m3u files.