From AppleLinks
“I found that Data Recovery Guru works as effortlessly and elegantly as claimed, and that there is only the most minimal learning curve involved. Using it is simple and intuitive. It does indeed “just work”."
In a similar manner as the Finder allows you to browse through regular files on your disks, Data Recovery Guru allows you to browse through and view your deleted files on external devices.
The App Store version allows you to scan external devices.
With this you can see what deleted files you have on your drive that are recoverable by the full version. From there there is the an In App Purchase available to purchase the ability to recover files. There is also a range of filetypes available in the free version included.
It allows you to view files that were in the trash after it's been emptied, and files from formatted, corrupted, or unmountable disks or other devices such as cameras and phones. You'll be surprised at what it'll find.