The title is self-explanatory
Yeah but Gmail app also comes with various other irrelevant annoying notifications (emails) I don’t want to be notified of.
Yes there is Nvato,notification for sales and comments
nWallet. I am using it since 2013. Without bugs. Notifies you on new comments, new sales, nice statistics, real time, no delays, material design, no power consuming, helpful developer, best app ever