Yes, 農業害蟲診斷圖鑑 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.
農業害蟲診斷圖鑑 is free.
To get estimated revenue of 農業害蟲診斷圖鑑 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.