SGN
I have been using over a year and never had any issues connection and it looks to have always stayed on.
Yes, SGN Connect is completely free and it doesn't have any in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
SGN Connect is free.
To get estimated revenue of SGN Connect app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.
I have been using over a year and never had any issues connection and it looks to have always stayed on.