Disk Xray performs three fundamental functions - and it performs them well
offering maximum security to restore all files in case you remove something accidentally.

Folder scanner
Folder scanner is a visual disk/folder analyser that enables you to spot large files and folders on your disk -  be it an entire hard disk or a subfolder, and provide a sorted breakdown of just where your disk space is being used. At a glance you can identify which folders are the space hogs and just what is in them by successively drilling down.

Duplicate Files and Folders Finder
Duplicate Files Detector frees up disk space by finding and deleting duplicate files and folders, giving you a chance to recover gigabytes of your disk space. This scan can reveal just how many copies of the same document, photo or other type of file you have saved, scattered through your disk. All duplicate files are checked byte-by-byte to give you 100% guarantee they are exact copies.

Disk Cleaner
Disk Cleaner speeds up your computer and by finding and removing temporary files on your computer. This includes the obvious choices of the Trash and Downloads folder, as well as locations you may not otherwise think to purge or even know where to find such as application logs, web browser caches and cookies, application caches and an ever-growing list of email attachments stored locally but never cleaned. It can also be set to find all large files on your disk. Decide how old the files you want to remove are, from one week to one month or one year.

System Requirements:
Disk Xray requires Mac OS X 10.8 or higher.
It is fully compatible with Mac OS X El Capitan.
 

Home Page - http://naarakstudio.com/diskxray/