SCAM: It tweeted bad numbers, links and hastags under the test account. Stay away
This one was sent in and I was suspicious from the start called (1.01 beta). It appears for good reason. Using a test account I logged into the application with oAuth an gave it rights. I was expecting to see a list of who unfollowed me in some report fashion. Maybe by date or after what tweet.
Unfortunately what was shows was a screen with a very bad pull of the profile picture and a number of people that supposedly unfollowed the account. No times, no names, nothing. Except a button to find lists that will follow you back to grow your followers.
We have reviewed a tool like this before, but it read your current followers and then compared it to then show who stopped. I was unsure how this one could build the list without a start point anyway.
The site that runs this is which puts fun tweets on their homepage. So use this at your own risk to no result we have seen yet.