Yes, 洛克希德·馬丁公司的F 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.
洛克希德·馬丁公司的F is free.
To get estimated revenue of 洛克希德·馬丁公司的F app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.