Great idea, but I get spooked easily. I signed up, figured I'd add GitHub, saw "This application will be able to delete any repository to which you have admin rights," and ran away.
Despite the admin rights, we don't include that functionality to delete repos. All we do is calculate and display cost, show relevant contextual info such as repos and organizations.
Again, we're rethinking how to limit things.
Cheers!
Feel free to check it out.