Yes, 爱建材智慧工厂 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.
爱建材智慧工厂 is free.
To get estimated revenue of 爱建材智慧工厂 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.