Addon identification

[Ghecko]

https://www.youtube.com/watch?v=Dw4eSaOAVT0
Can anyone tell me what addon the guy in the video is using to view an estimation of how much hes going to heal on his target and if its an overheal or not?(the bar in the center of the screen.

[mentaldino]

I think it's called HealingEstimator