Thank you for your review
$15 00
Email me when discounted: 
Dupin is an iTunes duplicates manager.

Dupin finds sets of duplicate tracks in iTunes based on the criteria you choose. It can then automatically select the "Keeper" tracks from among the duplicates using a variety of versatile filter options.

With Dupin you can:

  • Locate, sort, filter, and purge duplicate tracks
  • Remove duplicate tracks from iTunes and trash their files
  • Re-populate iTunes playlists
  • Preserve play history and ratings
  • Manage intentionally duplicated tracks
  • Copy tracks to new iTunes playlists
  • Audition tracks

What's New

Version 2.7.4:
  • Fixes issue with "Show in Finder"
  • Restores shortcuts for Library and Music library playlists in Playlist Popup
  • Improvements to Library Profile help tool
  • Addresses very rare issue accessing home folder that has been installed elsewhere
  • OS X 10.9 accommodations


  • OS X 10.7 or later
  • iTunes 10.0 or later

Similar Software

Open Comparison
Suggest Other Similar Software
Leave a Review

Dupin User Discussion

Nobody has reviewed or commented on this app yet. Add your own comment and get a discussion going!
Sort by: Time | Smiles
blanked Member IconReview+3

Yesterday's update (1.30) on August 31, 2013 causes Dupin Lite not to open. The icon appears for a few seconds and then disappears.

Reply0 replies
Version 2.7.1
Stephend1 Member IconReview+1

If it would open I would love to try it but it dont open

Reply3 replies
Version 2.7.1
Doug's Applescripts (Developer)

If you are experiencing a problem, please email the developer.


The developer's response is disingenuous and unprofessional. This problem is clearly not limited to the two original posters, nor to Dupin Lite: my (registered!) upgrade from Dupin 2.6.2 to 2.7.1 also fails to launch. Worse: the Web page makes no mention of this newly introduced bug—indeed makes it difficult to report any bug, what with no online form and an e-mail address buried in tiny, gray print. Doug Adams has contributed so very much to the Macintosh community; this is not his finest moment.

Doug's Applescripts (Developer)

I do not troubleshoot problems in the comments section of MacUpdate. This bug is limited to users on some European systems. It is clearly described on the Dupin FAQ page


If you have input to help solve this bug, please email me.

wishiwerealuddite Member IconReview+1

i'm giving this a bad rating because i paid for it and am angry because it deleted tons of my files and is giving me a huge headache. i'm generally very good at figuring out how things work but this program does not seem intuitive to me and when i thought i was deleting dupes for one album it deleted 500 tracks somehow. i may have made some error but it shouldn't be this hard to use -- i also had a hard time searching for certain tracks belonging to a certain artist etc. this was part of the problem. maybe the program works if you invest enough time to use it but i'm pretty pissed off with the results at the moment.

Reply0 replies
Version 2.4.2
xati-ba Member IconReview+237

Excellent software from the unconstested master of iTunes plugins. Does what it says and does it well, and is reasonably priced.

Reply0 replies
Version 2.4.1
tmiddlet Member IconReview+5

i recently bought a new MBP, and when i copied across my music i had doubles of almost every file 5000+ song.

i bought this app hoping it would help.

it didnt more then that, without this app i would up shit creek.

thank you so much for making this app, well worth the $15!

(for all the people saying there is no support.. why would u need support in the first place? it works flawlessly!)

Reply0 replies
Version 2.3.1
Pedro-Fardilha Member IconReview+222

On those rare occasions when I need this type of tool, Dupin was the one that was actually able to help me putting some order on my (multiple) iTunes libraries.
Not only that but also the dev was really fast and helpful answering my emails.
As someone that over the years used some of those great scripts that Doug Adams keeps on giving us for free, I didn't even had to think twice about buying this great app.

Reply0 replies
Version 2.2.4
Mredrup Member IconComment+63

No support, no way to contact the developer, bad all the way around.. I wouldnt suggest this software to anyone and DEEPLY regret my purchase. Oh and did I mention NO SUPPORT?

Reply4 replies
Version 2.0.6

Mh, ever tried to click on that tiny "developer page" link up there?
Or just click here to get a pony: http://dougscripts.com/itunes/itinfo/dupin.php


Actually yes being as this issue was 9 months ago... I and still got nothing from this extremely unfriendly developer... thanks for your suggestion..

Doug'S Applescripts (Developer)

MREDRUP and I had an email exchange on October 8, 2009. I can publish that exchange, if anyone is interested.


Sorry I missed the original post date.

Mredrup Member IconComment+63

Running 2.0.5 on PPC it keeps telling me to upgrade and the FAQ says the upgrade is for all users however it only downloads an INTEL binary over and over.. Please update the notes to say you have dropped support for your PPC customers. thank you.

Reply1 reply
Version 2.0.6

What? PPC support has been dropped? Super deal-breaker. I just bought this 2 months ago to use on my PowerPC iTunes server.

Why Doug, why?

maclover1.1 Member IconComment+742

One MAJOR drawback is the tiny checkbox, make it very hard to quickly make changes to a filtered list.. for instance I have many duplicates with an added " 1" at the end of the filename and Dupin does not have a way to sift through my filenames and for example tell it to always reject a track if it has a " 1" at its end. SO ANYWAY I need to manually check the one I wanna keep and uncheck the one I want to keep.. which is when that tiny tiny checkbox is really a silly badly thought annoyance as it it hard to clic, responds badly to my nonetheless precise to my Wacom pen.

Reply1 reply
Version 1.4.2
Anonymous Member Icon

The "Shortest filename" option in the Filter Controls will automatically keep the track without appended numbers. Sorry about the small checkboxes. iTunes' enable checkboxes are even smaller, however.

slob Member IconReview+80

I registered this partly as a gesture of appreciation for Doug's iTunes scripts - always useful - and partly of course to dupe more powerfully than iTunes allows.

So far it's better but not by enough. Specifically I'd like some kind of fuzzy logic for, say, the time length of songs because otherwise identical dupes often show a second or three difference from each other. I wouldn't mind that for names too, eg. ignoring brackets with contents.

Whatever, much appreciate Doug's scripts and look forward to Dupin's further development.

Reply0 replies
Version 1.1.1
user icon+0
Rob Browne
Version 2.6.1
user icon+0
Version 2.5.4
user icon+45
Version 2.4.2
> 3 10


Current Version (2.x)


Downloads 111,020
Version Downloads 10,300
License Demo
Date 14 Oct 2013
Platform Intel 64 / OS X / Intel 32
Price $15.00
Learn how MacUpdate Desktop makes installing apps from MacUpdate.com one-click easy.
Next time, install Dupin with 1-click

Learn how MacUpdate Desktop can install apps on MacUpdate with the simple click of the Install apps with MacUpdate Desktop icon. Plus, keep all your apps updated. Play video...