Yes, 韩语口袋单词书(有声点读) 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.
韩语口袋单词书(有声点读) is free.
To get estimated revenue of 韩语口袋单词书(有声点读) app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.