Yes, 漢語拼音圖卡 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.
漢語拼音圖卡 is free.
To get estimated revenue of 漢語拼音圖卡 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.