iTunes' "Show Duplicates" feature is helpful but you still have to examine every track to determine whether you want to keep or delete the tracks it finds. Smart Playlists are of dubious help and trying to locate all duplicates with them can be tedious as they can quickly crowd your Source list and slow iTunes down.

With Dupin you can:

• Quickly find all sets of duplicate iTunes tracks based on your choice of criteria
• Select the "Keeper" tracks from among a number of duplicates automatically using a variety of versatile filtering options
• Purge duplicate tracks from iTunes and send files to the Trash
• Manage intentionally duplicated tracks
• Copy tracks to new iTunes playlists
• View duplicates in non-loaded libraries created with iTunes' multiple library feature or iTunes Library Manager
• View duplicates in iTunes libraries on other machines on your local network
• Sort tracks and view track info
• Export a list of duplicates to a text file
• Locate tracks in the Finder and in iTunes
• Audition tracks

In addition, Dupin features:

• Familiar iTunes-like interface
• Robust Help
• Ample keyboard shortcuts
• Visual progress feedback during operations
• Customizable toolbars
• Optional update checking