@LeopoldBloom It is available already since long ago, but unfortunately iPhones don't support Push Notifications yet. All other devices support all features.
@Nuno I tried that, but I couldn't find a "share" button on the site in Safari.
I was referring to a dedicated app available at the Apple store. I'm not concerned about push notifications as I would disable those anyway. Right now I have Google Chrome set to the SW, so I just use that as if it was a dedicated app since I use Safari for everything else.