It saved me a ton of time, pretty accurate

After I migrated my itunes collection from my PC to my new macbook, I found myself with a very disorganized library with over 1,000 duplicates. I started going through the library with MusicBrainz Picard to get the right info, but it took forever to organize and find duplicates through iTunes. I took a leap of faith with this app, as there weren’t many alternatives, and I couldn’t tell with the low review count if it was going to help me out or not. Although it has it’s faults, the app worked to my satisfaction and saved me a ton of time.

Unlike iTunes, the app had no problems with similar tracks. It allows you to match songs based on same title, artist, and album, so Live albums did not get confused with studio albums. That made it much easier to rely on the app to pick the right duplicates.

Once you scan your library and come up with a duplicate list, you can filter the results on what you would like to keep. I prefer the AAC file format over the MP3 one, so I set it up to keep AAC versions of my songs. I was also able to choose that I wanted to keep the oldest song added to the library over the newest. There are many more options on the filter to customize what you would like to keep (bitrate, rating, play count…etc).

Since I have some iCloud purchased songs, Dupin did not delete the songs from the app. What it did was put the songs into a playlist, which I was then able to delete using commad+option+delete from itunes. This actually helped me to verify the accuracy of the songs it wanted to purge before I actually purged them. The only real issue I cam accross was that Dupin would select iCloud songs as duplicates when they were not. Maybe that has something to do with it being listed as an iCloud song and a downloadable song. Either way, I did not purge any iCloud songs from my library, focusing only on non-icloud songs

Pros:
You can customize how you want the app to pick and choose duplicates
You can remove dead (!) songs from your library
You can choose to highligh songs and simply purge those instead
Filter out songs based on file type, ratings, playcount…etc
Dupin puts to delete songs into a playlist so you can double check before purging
Very quick app, saved me a ton of time, many more options than itunes “Find Dupicates"

Cons:
App is a bit pricey for my tastes, but the time saved helped me swallow the cost
Sometimes Dupin would not remove all dead links.
iCloud purchases showed up as duplicates when they were single downloaded songs
Dupin could not purge duplicates that pointed to the same file. You’ll need to manually delete those

If you have a large library and are in need of purging some duplicates, remove some dead links, this is a great program. The price is kinda high, but it does a great job, and it is pretty accurate. Maybe you can catch it on sale at some point. THis along with MusicBrainz Picard should help you to organize your bloated library.

SickNic about Dupin Lite 2