Yes, 災情調查與資訊收集工具 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.
災情調查與資訊收集工具 is free.
To get estimated revenue of 災情調查與資訊收集工具 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.