Yes, 全民找相同 - 找茬+找不同 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.
全民找相同 - 找茬+找不同 is free.
To get estimated revenue of 全民找相同 - 找茬+找不同 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.