Yes, 隐智棋盘课堂HD 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.
隐智棋盘课堂HD is free.
To get estimated revenue of 隐智棋盘课堂HD app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.