Here is the list of info that the app can detect :
Once you launch the app , you have to hit scrub for the app to do its magic. I don’t see the reason why there is a need to launch the app and press the button for the app to run.
Since there are no menu option or any other configuration options, it would be great to see the app remove the extra step of clicking the Scrub button. Once you hit scrub it will throw a warning message telling you it might take a while to do the task and then the app displays details about the missing info. You can drill down each info and directly lauch the contact editor to add the missing info.