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