Yes, 열체크 by 닥터아이 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.
열체크 by 닥터아이 is free.
To get estimated revenue of 열체크 by 닥터아이 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.