Ha! But really I don't get notifications with 6tin either. (And yes,,I get matches and messages,, thank you very much..)
If the app is not open and in view meaning the screen active I don't get any notifications. I have to constantly be opening the app to see if there are any messages. VERY inconvenient! Sadly I have an old Android phone that I use on wifi at home if I'm communicating with someone. I have even switched the SIM chip to go out sometimes if I am meeting someone from Tinder.
I so wanted to use the 6tin app but the lack of live notification make it unusable to me....