Yes, 馬戲團腹肌鍛煉 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.
馬戲團腹肌鍛煉 is free.
To get estimated revenue of 馬戲團腹肌鍛煉 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.