Vibify aims to inform you for any pending notifications on your phone. To do that, Vibify does a very small vibration when you pick up your phone. Vibify works only if your phone remains locked and still, saving up as much battery as possible. Select the applications you want to be supported by Vibify and enjoy.
A similar feature is available on some Samsung devices called "Smart Alert", but Vibify offers you even more options and customization.