Yes, 穿戴式胎儿心电监测仪 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.
穿戴式胎儿心电监测仪 is free.
To get estimated revenue of 穿戴式胎儿心电监测仪 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.