You don't need any additional software to check if your hard disk is failing or not on a mac.
Simply go to your applications folder, click on utilities and select disk utility.
Click on the hard disk you want to check and look at bottom of the window. You are looking for a field called S.M.A.R.T. Status. If it says "verified" than your hard disk is fine. If it says "Failing" than your hard drive is failing.
If it says "Failing" I would recommend that you backup your files straight away.