What app has a red heart notification that is displayed in notification bar ?

[AC Question]

Red heart on top left hand side of phone in notification bar that is always there

 

[AlphaTango414]

Pull down your notification shade. Is there any notification tabs that show up? If so, long press the tab and it will give you the option of opening app details. This will tell you what app is doing it.

Being on the left side, it is not a system related app.