Yes, 大家的日语口语精编版-标准日本语 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.
大家的日语口语精编版-标准日本语 is free.
To get estimated revenue of 大家的日语口语精编版-标准日本语 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.