Yes, قواعد اللغة الألمانية 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.
قواعد اللغة الألمانية is free.
To get estimated revenue of قواعد اللغة الألمانية app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.