Yes, 格兰仕扫地机器人 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.
格兰仕扫地机器人 is free.
To get estimated revenue of 格兰仕扫地机器人 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.