Yes, 北师大小英(三年级起点)高清版 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.
北师大小英(三年级起点)高清版 is free.
To get estimated revenue of 北师大小英(三年级起点)高清版 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.