会話を始める前の英文法 is not free (it costs 6990.00), however it doesn't contain in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
The price of 会話を始める前の英文法 is 6990.00.
To get estimated revenue of 会話を始める前の英文法 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.